It sucks because I know a lot of people referred to as SJWs, myself among them sometimes, and my read is that what pisses people off about them is not exclusive to minorities or the left wing, but the label tends to just apply to people advocating for the oppressed, and the behavior often comes from pain and vulnerability.

A lot of marginalized people lack the space irl to be politically active in a meaningful way. This goes double if you're trans or closeted or showing up irl is dangerous in any way. Online, you have a platform and can speak your truth, but that's about it. Social media platforms are incentivized to put a bunch of chuds you don't agree with in front of you to keep you engaged, and so people end up angrier and angrier, stuck constantly responding to bigotry but never able to actually do much about it, or even hold a good faith conversation. Pet peeves become big sore spots because people keep poking at them and it feels like there's nothing that can be done to change how anyone feels. Small disagreements over language become big blowouts because it's probably the tenth time it's happened today and it might not feel like anyone's on your side.

Funny enough the person I know who fits this description the most is a right-wing incel, marginalized in some ways due to neurodivergence. He's prone to big conspiratorial blowouts at the mere mention of climate change or queer people because he sees it as necessary to "educate" people. I don't think most would call him an SJW yet his engagement with politics and the ways in which he pisses people off are exactly the same.