Social control, 'showing the door', is abused to silence dissidents.
Plenty of methaforical ideological death marches on different topics could have been avoided by social gatekeepers not having the social power to silence their friends or party co-members.
Pretending the question is really about someone being rude is patronizing by XKCD.
The concept of 'showing the door' is fine for practical reasons but the other present at the party need to follow in protest on any just so slightly transgression of power.
So now when authoritarianism and racism are in fashion again in ”the West”, those political movements that oppose it are in a quite bad spot, since freedom of thought and expression have been turned down to do a shortsighted delay of the shift in the first place.