I’m willing to believe that there’s a grain of truth in this at face value, but from what I’ve seen, most communities will ban people for inflammatory disagreement. A lot of people here approach such discussions from other instances in bad faith (even I did above), but those outside of the instance are generally the ones more likely to be banned for it. These discussions will start somewhat heated, eventually degrade when one or both parties get frustrated, bans are issued, and then people will recall this discussion later as being ‘banned for having a different opinion’. I’m sure it happens but it’s not as common as people claim imo.