Obviously I'm generalising here, but I feel like this is largely the outcome of putting a bunch of middle-aged white STEM bros on the same small social media network as a bunch of queer communists who trend a lot younger.
The latter group would be mostly content keeping to itself (albeit with the usual amount of infighting), but the former group sees it as its god-given duty to barge in and disrupt any and all "echo chambers" they happen into online. They have all the social awareness and political literacy of the stereotypical facebook boomer, they're just more technically literate.
To be clear, a lot of folks here are perfectly amicable, but if the quality of the experience on Reddit hadn't dropped so drastically in the last two and a half years that I found myself questioning my sanity I probably wouldn't have come back here.