A big part of this is the degree to which people in their 20's and 30's are willing to unperson someone in public spaces -- even in person -- just for the suspicion of holding to the wrong ideological viewpoint, or even just for being from the "wrong tribe." It's so common to encounter some sort of unfounded imputation of hidden unsavory motivations. This sort of thing manifested itself in the 80's as a bigoted/snap judgement questioning of one's religious affiliation or sexual orientation.
It was back in the 80's and 90's when I started to develop my information-flow technique for evaluating people: I would watch how they would evaluate me, and gauge what information they used to jump to which conclusions. Bigots often jump to wildly inaccurate conclusions quickly on scant information. Bigots often impute under-the surface motivations without justifiable evidence. I've seen such jumping/imputation in rural South Carolina and from people in poor white neighborhoods in Ohio. What's surprising to me, is the remarkable frequency with which I've seen essentially the same jumping/imputation in the Bay Area.
If you want community, start by exercising the Principle of Charity. Allow for a Loyal Opposition. The vast majority of people have well-meaning (as well as self serving) reasons for their positions. If you want community, let people speak and listen to them. If you want to destroy community, then silence people and impute dark motives.