As I explained to you elsewhere:

The only reason dicksucking is usable as a pejorative is to draw on historic sexism and homophobia, and telling someone to suck your dick draws on that social trauma. Telling someone to give you a haircut, for example, is still a service but doesn’t have that social trauma to make it a pejorative, and thus it doesn’t hit like one.

It's basically drawing on SA to be used as an insult. If you don't think telling someone to suck your dick is drawing on historic bigotry towards groups that traditionally do that, then I'd like to know why you think it works as an insult.

Go have your conversation in private if you don't want public comments on it.

And wash up before you offer me your body, cupcake.