Also a more general note: If there's 3 or 4 people not understanding/defending/opining on the same thing, and only 1 person in the room that can explain or holds a different opinion... next time, slow the discussion the hell down. Like waaay down. You can't expect 1 person to field that many responses, people will feel drowned out and a honest open conversation can't happen.
Things will escalate into stuff like above, where people use harsher words because of frustration and sometimes even just to make their messages stand out in a sea of similar messages. It's not healthy.