I don't think people even realize when they're doing it. Or when they move the goalposts, strawman, reduce to the absurd incorrectly, trying to win rather than trying to discuss, etc. Not that I'm not guilty of some myself, either -- but I try to be aware of myself when it happens (I've deleted a number of posts completely after writing them entirely out rather than degenerate into pointless bickering, I'm sure it unfortunately feels like I'm ignoring a good point -- but when I can't find something constructive to reply with I'd prefer to just let that thread of conversation die)It doesn't but why mud sling, it doesn't make you look good even if it is fun.
I guess the point I'm making is that people feel they're making solid points (So get understandably upset when the person replying to them ignores what they think is their point) but when reviewed carefully they're actually ignoring the point being made in favor of making their own. And it's endemic here.
Note that this is not a new thing, this has existed since back during the huge ban-or-not-ban MK discussions, with an almost entirely different set of people involved.