My boyfriend insulted my sister. Should I be okay with it ?

Yriuqni
Me and my boyfriend were talking about diets .. and suddenly he brought up the subject that my sister was (bad word for fat cow ) ..and I told him he shouldn't say that about my sister...and he was like there's nothing wrong with it. So I realized he didn't understand that I was hurt so I was like " what if I called your mom cow now, would you be fine with it"..and he got all mad about it .. and started calling my sister names.. and that I insulted his mom and bla bla .. I apologized and said that I didn't mean to insult her, I just wanted to make him realize what he was saying ..

Anyway.. he said that he loves him mom very much and no one insults her.. I said okay then that's how much I love my sister so he shouldn't insult her. Then he said that no my love to my sis is nothing compared to his love to his mom..I said it's not his business how much I love my family.. I actually love my sis just like he loves his mom .. and I love my mom more than my sis and his mom... He got really offended and called my sister names.. and I was like don't talk like that .. and he said " then hang up so I won't start insulting you too " ..and I hung up ..

I know this whole thing sounds childish and immature.. but I don't know how on earth we reached such discussion and such level of immaturity... I am very mad at him for doing what he did and for the fact that he started insulting first .. but I am I wrong in this whole thing ? Should I be okay when he calls to apologize ( if he will ) ? .. I am really hurt and this is gonna be a huge deal .. and it won't go away fast.. but I don't know .. please someone enlighten me :) Thank you
Updates
+1 y
@Konnour : I forgot to add.. I am not egyptian myself .. I am totally European , I just live here from a couple of years. :)
Updates
+1 y
He didn't call untill now .. he most probably thinks that I am 100% guilty .. Gah I hate this so much and I hate the fact that I miss him , while I am really mad at him.. ugh :S
My boyfriend insulted my sister. Should I be okay with it ?
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