Is it wrong if when I see a spiderweb tattoo on someone's elbow, I think they're an idiot?
Why do you thing that style of tattoo makes them an idiot?
Only an idiot would get such a tattoo.
I get not liking certain tattoos, but you shouldn't judge someone's intelligence just on that. You may miss out on someone who's smart and could help you.
I tend to judge people by the way they look.
Don't judge a book by its cover right? How other's appear isn't what defines their intelligence or any characteristic. Experience who they are by taking the time to talk to them and see what you learn.