Yes those are the worst. Some people think that a normal conversation should be an exchange of contradictions, even when agreeing. I know exactly 1 person like that in real life who hasn't matured beyond that, but with the size of Reddit, there'd always be one.

I also got a funny reply one time from someone who claimed to have just thought something unique, after which he literally just rewrote my exact post. Basically doing "I made this" while trying to argue about it. After all I'm glad I managed to make him understand something, but he must be an insufferable genius to be around.

Eventually there will be crazy people here too, but so far it seems a lot less pretentious than the Reddit hivemind.