I don’t know if this is funny or not.

Or why it is. But I feel like Dad really needs to check his language.

Definitely need more context on the existing relationship. If it’s very casual and sarcastic/joking back and forth all the time, this seems like a funny dad. If he just berates his son like this and isn’t being lighthearted, it’s verbally abusive. Hard to judge from just a text screenshot.

TBF it’s a bit uncommon to berate someone for their sexuality and then insist that they and their partner join you for dinner.