[wjn0]

A few weeks ago I walked past a group of people with huge (2m x 3m) posters of aborted fetuses outside one of the biggest buildings of my university campus. These same people have been accused of berating people who disagree with them. I find that behaviour and form of protest. Do I think it should be illegal? Definitely not. Do I think it's anti-social? Yes. As a mirror to this example, if in my (liberal) home state anti-gun nuts were to lobby for a change in gun policy with pictures of dead school kids from shooting <x> outside my university, I'd be similarly displeased with the nature of that political rhetoric.

There are leftist groups that protest in anti-social ways to varying degrees, so it's by no means unique to the right. An extreme example would be groups masquerading as Antifa destroying property. (Like I said, varying degrees of anti-social behaviour.) One of the positions of the author, it seems, is that anti-social political discourse is particularly dangerous in small towns, due to the echo chamber effect.

So, to answer your question simply: ideally, political discourse is well-reasoned, and measured in its intensity. One person expounding on their political beliefs with the intention of causing genuine emotional distress in another individual would be anti-social, in my view.