I don't think I really need to explain much, their admins are transphobic. 
https://hexbear.net/post/1587342
Snowe, an admin, complained about a transgender person being offended over being misgendered. Ategon made an apology post but keeps snowe on, no public apologies from snowe to the transgender people affected.
Textbook 
note: conversation about Ategon's use of the word triggered edited out, might be misunderstanding, need clarified
This genuinely read to me as them using "triggered" in the other sense, like "caused," as gets used in programming speak sometimes. I would never try to argue this as being true because I feel silly in retrospect, but just thought I'd share.
yeah now that two people have said it, gonna edit it out. i feel like this is my brain doing some weird flips, czechs hell of a drug
Your reading is very reasonable (I think that a general audience of native English speakers would be split on the which sense was being used), so there's no need to blame yourself either way.
That Czechs out.
nah they're referring to branches of a comment thread being "triggered" in the colloquial sense unless i'm misunderstanding the narrative around the images I can't see (and won't bother going to programming.dev to see)