Well, I don't know about all people, but it did and still does for me.

My friend's parents "accidentally" let it slip to her that I had ADHD. She went and told everyone I know, even though I didn't want anyone to know.

After that, everybody in my class treated me differently. They made fun of me a lot when another kid in my class who has ADHD also (except unlike me, he's not medicated and just a jerk without the ADHD) and then said to me things along the line of "Oh look you found your soulmate another person with ADHD" and other cruel things like that.

I think this is unfair because

1. Not all ADHD Is the same, and I actually have ADD

2. He's a jerk and no one's soulmate should be a jerk

Also, whenever I got a bad grade on a paper, people would excuse it as me being "stupid" because I have ADD. I am in fact, not stupid. I scored in the 99th percentile on standardized testing, I now go to an extremely academically challenging college prep high school, and my father who also has ADHD has an MD.

So no, just because you have ADHD doesn't mean you're stupid.

I guess it does cause bullying. It made everyone treat me like an outcast, which is, essentially bullying.

I hope this helps!!

Lots of good wishes,
A friend