People have definitely diluted the word trigger, and it is impossible to tell the difference between someone referencing a traumatic experience or something akin to annoyance or being distracted. 'Triggered my anxiety' where anxiety is also diluted to 'something I would prefer not to deal with'.

In this case, it seemed like the phrasing was enough to distract them from a discussion that didnt need to be derailed

Since you didn’t give any indication that you were using the “diluted” meaning, I’d say it is more accurate to say that you miscommunicated, rather than that anyone got distracted.

Okay I’ll take it

I was curious about why they felt compelled to take the thread that direction when the meaning was clear. They felt CSAM was being minimized when that was a red herring to the discussion.