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
To be fair,
They're throwing snowe under the bus and openly blame them for it further down. This is a bit of context that I guess is kinda excusing it, although in my opinion your third party program messing up an interaction with someone is a problem that could easily be resolved by realizing you made a mistake and fixing it, which snowe of course didn't do. So maybe they're giving too much credit to a bad admin but I don't think they're really defending the behavior.
I think the triggered has an unclear antecedent, but I read it as "a branch of the conversation was triggered (as in caused/set off)" not "a user was triggered."
That said, I don't really have strong feelings about programming.dev. They don't seem to show up here much but it's a mixed bag when they do.
The argument that they're using "triggered in a programming sense" is more reason to defed. What it really is is an appeal to nerd identity politics. These people revolve their identity around some lame nerd subculture, and any conflict with them turns into them thinking "wow these normies just don't understand me, a super special computer toucher!!!!!". It's insufferable whiny BS I have to deal with enough of in real life.
It's also why every "tech" community devolves into nerds whining about culture wars BS instead of actual technical discussion. They're more interested in identifying as a programmer than the actual content of programming.
This is exactly something that happens around these parts as well tbh