Disrespect and Belittling me

Lately when me and my boyfriend jokes with one another her tends to give me commands such as “sit,” “snapping his fingers,” “bye with a hand shooing” as if I am an animal. Also, I took a 10 minute shower and he said “you was in there for all of 1 minute I know yo ass still dirty”

He’s been doing and saying stuff like this lately and in front of his siblings. I notice they laugh when he’s saying things like that to me but when I say a belittling or humiliating joke back their response is completely silent.

I tried to talk to him about it but he’s just saying I just be joking. But he’s not seeing how I’m offended.

I need truthful advice and suggestions.