Why do people still hate bronies?

When the fandom was first starting out, there were certainly a lot of weird and repulsive things going on. And it was weird to see adults watching a cartoon for little girls.

But many years have passed. Many adults watch cartoons for children, because they have a good plot and characters. Moreover, in every fandom there are creepy obsessed fans. But for some reason people still look with disdain at bronies (like in r/4chan, r/greentext), thinking that they are creepy (for watching the cartoon), pedos, degenerates, abnormal functional adults. Why do people always generalize bronies (even though every fandom has creepy fans) and look with negativity after so many years?

How do you deal with this negativity and contempt from people (especially when they find out you're a bronie)? What advice can you give to avoid anger?