Boyfriend jealous of my son's "manhood"

My boyfriend has been acting an ass towards me and my son lately. He accidentally walked in on my son(he's 15) and told me if I knew how big my sons "dong" was. Of course not! He said he never felt insecure about his sise until he saw my son's. My boyfriend is 8 inches and has a huge girth size so I don't understand what he's so insecure about but he's saying my son is so huge. I really didn't want to hear about my son's penis so I told him to drop it buy he got MAD at me. My son came home from his friends house and gave me a kiss and said "I love you mommy" (he calls me mommy sometimes) and my boyfriend got upset and said "You wanna fuck your mom or something?" My son said "No! Gross!" And my boyfriend walked away pissed off. My son asked did he do something wrong and I said no. He continues to make gross comments like that. I just wish he would let it go! His gets this jealous of a teenager?! My son isn't allowed to hug me without a rude comment. Even if I'm hugging him to help him when he's sad.

Edit: My boyfriend is being an ass rn but he's never actually hurt my son so I don't think he's dangerous. He's just being an insecure ass rn