I was going to say "No, definitely not", but if "BS" counts as cursing rather than simply as vulgarity, then yes, he has said that once or twice in response to statements I've made. But not in an aggressive way, and it did not make me feel threatened or anything like that.

He does curse sometimes; not all the time, but occasionally. As do I. I think those words have a different load to him than to me, since we speak his native language and my second language.