I've had to bring up Google Images and search up "ADHD Brain vs Normal Brain" before for people. I think a lot of folks don't realize that ADHD actually comes from tangible, structural brain differences, and seeing that puts it into the same realm as other "real" medical problems for them.
Regarding:
everyone has ADHD these days thanks to the internet
I have written extensively in my comment history about the differences between ADHD (the structural and heritable attention issue) and VAST (variable attention stimulus trait, aka the brain poorly making connections when people, especially kids, are exposed to screens too long). I'll dig up that comment and post it as a self-reply, but essentially: the symptoms are very similar, but the origin differs.