Both can be funny in the right context. Furthermore, using “straight” as an insult doesn’t uphold any kind of systemic oppression, so I have a hard time reading it as anything other than a joke.

The most problematic thing about it is that it is reminiscent of homophobia, but y’all gotta learn to make the difference. Giving bigoted straight people a taste of their own medicine in a context where it cannot possibly hurt them (unlike actual homophobia) is funny.