Can I tell my boyfriend that I can no longer support his work after his staff were rude to me?
What happened that made you feel disrespected?
He talked down to me and insulted me. He made me feel like I was stealing the limelight from him.
It's understandable that you are offended by someone being rude to you. You should talk to your boyfriend about how this made you feel and forgive him as you move forward.
Telling him that maybe he can trash someone else's work.
You can tell him that you were hurt, and maybe your boyfriend will take care of you. I doubt he cares more about his staff than you supporting him.