Opinions needed!!!!! Am I out of line?

So today at the dinner table with my family, my brothers girlfriend had ordered a burger at the restaurant. When it arrived she was like “this is so big I couldn’t even get it in my mouth and I tried!” And my boyfriend looks at my brother and goes, “must be tough for you” and I was so embarrassed. It felt disrespected and upset. IN FRONT OF MY FAMILY. I finally tried to tell my boyfriend how I felt and his response was “I didn’t do anything wrong, you are acting ridiculous and childish right now.” I said, “it might be okay in your eyes but it was disrespectful to me.” And he put me down for feeling upset. He was like “why don’t you break up with me about it” I feel like I do not deserve to be ridiculed for being upset, by my SO. Also my sister is pregnant and he has made comments to her about taking her baby daddy’s dick (taking about how big his dick was). I just don’t know if I’m overreacting or not, but I’m starting to doubt this...

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