I am writing this with the assumption that you are tacitly asking about US politics because of the moment in history. What I have to say will make people mad, but here goes:
A lot of the people on this webzone are what Eitan Hersh called "political hobbyists". These are people who do not really take political action in their daily life despite voting or occasionally attending a rally. They may be well informed about politics, but being well-informed in itself is not really effective at changing politics. You can get on your phone and "rub the glass" to complain about politics, or to find people who agree with you. But outrage on social media won't change anything, and if rubbing the glass and occasionally voting is all you do, then you are a political hobbyist.
Political hobbyism mostly functions as a consumerist approach to political engagement. A political hobbyist will passively receive news and information about politics, but will never really try to change anything, because to them engaging in a news feed is all they really do. That consumerism is painfully apparent here when, for example, posters denounce a Democratic candidate as being "not exciting" or someone they are "not passionate about" as if the candidate was the newest model in a brand of laptops that failed to zazzle in Q3. We see signs of political hobbyism again when political parties are treated as entities that are somehow completely separate from the public. For example when a lemmy user denounces the Democratic party for not doing what they want. "The Democrats need to do X!" Why are you complaining about that on the internet? You know the DNC isn't reading these threads right?
If you really wanted to influence the Democratic party (which I think is the best bet for resisting fascism right now) why aren't you lobbying the party? Why aren't you mobilizing voter bases? Why aren't you building political power in your local community so you can influence larger political organizations? Because its hard, because you don't know where to start, because you are busy? Ok, but fascism is coming, and you are too busy to do anything about it. Or too overwhelmed to even try?
The truth is, if you wanted your ideas (and I am including here opposition to fascism as an idea) to influence policy, or what candidates gain traction in nomination races, then you should have been working on that LOOOOONNNNNG before the national candidate was nominated. Treating the Democratic party as a vendor that offers political products is a losing strategy for gaining influence. There will be an endless parade of glass rubbers ready to denounce the various political parties, but by and large, they didn't do anything to gain influence with those parties. Their denouncements are ignored, they are irrelevant. My advice is to ignore the glass-rubbers. Identify one or two local issues in your physical area and try to improve them. What you should do is find a little slice of America (or your own country if you are not American) and try to make it better. Use those efforts to build up influence at higher levels. My goal here was to convince you not to listen to the glass rubbers. But my advice for resisting fascism is: Try to build political networks, try to mobilize local voters in local issue elections. Doing this will make your network an invaluable asset to larger (state and national) organizations. If you have a network of voters, of issue conscious citizens, or donors, larger organizations are going to want to leverage that network when it comes time for lager races. That gives you leverage. That gives you power. The glass-rubbers are going to tell you that is impossible. Its not. People do it all the time. The book I cited has examples of people doing it. Fascist conservative groups do it all the time. So why not you?
I will admit, this is hard. When I first read Hersh's book I was offended, because when he was describing political hobbyists, he was describing me. But it did give me some motivation to think about politics from the perspective of power. And set me down the road of trying to do all things I wrote about here. It is early days for me yet, and I have only seen limited success. My work complicates things. I am busy, and often overwhelmed. But fascism is coming.
Political hobbyists are people who consume political content, but don't do anything substantive with it. There probably are MAGA types who are political hobbyists, but the movement in general is extremely politically active, organized, motivated, and effective across all levels of public life. They influence conservative politics through those organizational efforts. The MAGA movement came to power by leveraging networks of activists and voters to build political infrastructure that could be used to drive voters to the polls, fund candidates, coordinate campaigns and set the scope of policy, which they do very effectively. If you want to be effective you should be building political networks too.
Also, this is an aside, but political messaging is way less effective at persuasion than your comments here suggest. In practice this type of messaging tends to only reach people who already agree with it, and the persuasive effects of media on political attitudes have very weak effects that are attenuated quickly (Look up something called the hypodermic model of mass communication if you want to know more). Benkler, Faris, and Robberts offer really good illustrations of this in practice. By analyzing the spread of political messaging in news and social media networks, they show that most of the misinformation, lies, and propaganda that circulate through conservative media spaces do so because conservative media consumers want that content and punish outlets that criticize it. Creating 'counter messaging' is unlikely to be effective because conservatives would just reject the messaging.