Am i allowed to be mad

My bf and i were laying on the couch and i sat up and my stomach ( like everyone elses has rolls) i am very self conscious and my bf goes "look at all those rolls". Other people were there so i didnt make a big deal but it upsets. My bf is bigger and i never want to offend him. He saud it was a joke but its not its just rude imo. I'm pissed at him now because his 5 second comment will stay in my head for days.