In short, we bring it on ourselves.
Incorrect. The real answer is that there are hate-filled people in this world who simply want to dump on others because it makes them feel big. My dad and my brother are two excellent examples. They both used to tell me how stupid and worthless I was because I liked Star Trek AND treated women with respect (in other words, I didn't bed them then kick them out, but that's a whole other story), while ironically ignoring the fact that my dad watched TOS and my brother enjoyed TNG.
Of course, they also told me I was a closed minded asshole because I don't drink beer or shoot heroin, but I ignored that.