If you're racist, sexist, homophobic or transphobic.
If you go out of your way to harass people
Except if it's pedophiles or any mentioned above^
If you're a TERF
If you don't believe in asexuality
If you fetishize real people
If you are 'anti-fujoshi'
// I don't judge anyone based on their faves/fandoms (though I'm more careful around real people fandoms) so as long as you're not hurting anyone, you do you!