3 way online chat, we know each other irl. Girl, me, dude. None of us is attached to the other (in fact she's pretty ugly so low SMV). Discussing sex and for some reason dude's behaving like he owns her even though I'm pretty sure they haven't banged or w/e

Was trying to practice exerting some push of push-pull, but he butted in midway and I lost frame.

It's along these lines:

G: You could use paper to fuck her

M: Lmao that's ridiculous, just stop talking

D: Eh stop shitting on my cookie she's my cookie not yours, don't tell her to shut up

M: haha nah i talk to whoever I want, I'll talk to your pussy if I need to

D: You're the pussy you deadbeat pussy.

G: rooting for you D!

We're in the same clique and lately it seems like everyone goes quiet when D and I start doing verbal exchanges. It never comes to a head but sounds rough as hell because he has very offensive vocabulary. I'm confused by this and the implications. There are three other girls and two other guys in the group.