It mainly stems from self validation.
For a lot of people, validation comes form not necessarily what their side is doing but more about what the competition isn't doing.
Then they want to further reinforce their belief by continuously highlighting the differences they classify as weaknesses.
You see all the time. Someone will go test drive a bmw and Mercedes for example. They'll buy one and then run around telling the world how the one they didn't buy was lacking and how awesome their selection is.
Get old and repetitive but it is what it is.
good point
I read PS4 threads sometimes but almost NEVER post in them as I have nothing productive to say about it.
Because those crying "SALT!" and "You'll be eating crow on tuesday!!1!" do nothing but keep rational thought out of a discussion. Not to mention like someone else stated, it creates an Us vs. Them environment..
Far enough but you are downplaying the MS trolling before that started because the thread was already shit upon