You know, back in the day when we disagreed with the position of a speaker attending the university we would turn up, listen to the talk, and raise our hands at the end to ask our questions or make our comments.
These question sessions could get quite combative, but no-one swore, no-one got pushed or shoved, and no-one was screamed at, not even the NATO guy who had the CND Soc in the audience. He faced a bit of a Wolfie Smith rant at one point, but it was all healthy, vigorous debate.