I think people irrationally get offended by swearing. There's a big difference between "you're gay" meant to insult somebody and "whatever gay shit you want" indicating that they think the content might be too unimportant, pretentious or touchy-feely. None of them have anything to do with actual homosexuals and doesn't sound like homophobia at all, just misunderstandings of different cultures.

That said, it can be a clue that the person might be generally disrespectful of others and to be on the lookout for real harm they may do. Though it's a dangerous slide from "does what bad people do" to "is a bad person" which is a kind of discrimination.