We are going through a general uptick in authoritarian "discussions" online. It's interesting that you are only seeing it on the "left".
There's a bunch of ways to measure political opinions. The Authoritarian-liberal one being one of many. The economic-left and the economic-right are becoming more separated from the social-left and the social-right.
Tribalism also causes people to take on the positions of their 'tribe' which may be distinct to what their own personalities might normally gravitate to.
In the past, it has been the economic-left and social-right that were more prone to authoritarianism with their proponents believing that their ideals should be enforced.
The economic-right and social-left was more of a logic vs empathy tension ('this works' vs 'this is right') and a lot of people seemed to reconcile the two for one flavour of centrism.
To me it is a little shocking how authoritarian elements of the social-left have become, an ideology that has long been characterized by empathy and supporting others seems to have become blended with opinions which are exclusionary or dogmatic, which seem counter to their own principles.
In some respects maybe this is just the march of time making the progressive opinions of one generation the orthodoxy of the next and these people are just finding a new conservatism rooted in a new orthodoxy.
It's rather more likely that the increase of left-authoritarianism is due to increasing resistance to moving the Overton Window, both the left-most edge and the right-most edge, leftwards. As resistance increases more forceful techniques are necessary.
Such as?
More tolerance is pretty much the definition of the social-left.
It may very well feel that way to people who live in strong bubbles, but it just isn't true across the general population -- which of course is how the Overton Window is defined.
Yes, I see that the left has become more authoritarian, but it pales to the hard shift I see on the right.
I somewhat expect authoritarianism on the right and therefore would hold the left (to which I belong) at a higher standard.
One explanation is that now things have switched round, and people with left-wings beliefs, sometimes extremely life-wing beliefs, control a lot of institutions and structures. People who are my age (too old) grew up with the right being in that position, but I don't think that's a contemporary instinct to possess.
Regardless, the owner is well within his right to make an emotional decision based on his beliefs to stop anyway.