Is it normal for people to resort to cussing in arguments?

Is this just straight up toxic?? I'm talking people who throw around harsh words such as the c word, b word and other things at their partner. I for one believe that you can argue and fight without resorting to cussing at someone like a mad person? I'm asking this question because the relationship I am currently in, my boyfriend has called me many things while we have thought and I'm considering leaving him because of it. I think a grown adult with a mature mindset would have more control over themselves than that. What do you guys think? I mean... where does the line get crossed over into emotional abuse? Or is any name calling at all considered emotionally abusive? Thoughts?