Well that might be because "triggered" and "microaggressions" both seem to be partly political concepts. Basically I see a wide gulf between (1) stuff that could reasonably upset people and (2) the "approved list" of Official Triggers
tm.
It's honestly not surprising. How many regular women you know, even ones who call themselves feminists seem to get in a spin about even a fraction of the stuff that outrages the feminist blogs? A lot of things that have the "internet" in an uproar don't seem to even be on the radar of most regular people. That includes most LGBT people, feminists etc as well. They're not all busy being outraged constantly about minor things, because they have lives.
The rhetoric of activism is often at odds with the lives of the supposed people that activism is speaking for. e.g. marxism has often been middle-class intellectuals "speaking" for blue-collar workers - while often disdaining everything
about working-class culture, then wondering why all the "ignorant uncultured" workers are so stupid that they're not supporting your party, when you clearly know what's best for them.
Seriously, if you were to say you were triggered by seeing people getting shot in movies, people would look at you funny, because we know that's not how 'triggered' is
meant to be used. It's not actually a means of preventing people being exposed to stuff they might get distressed by, we have very few controls on any of that, it's about controlling interpersonal dialogue, and it's even limited in that: you can only claim to be triggered about an official list of triggers. Saying you're triggered by anything not on that list just comes across as ludicrous, no matter how reasonable it is.
One interesting angle on the whole thing is to look at the history of interpersonal cultures. Honor cultures gave way to dignity cultures, now people have identified a new trend of victimhood cultures. Hint: it's pretty new and it seems to be appearing on both the left and right of the political spectrum.
http://www.theatlantic.com/politics/archive/2015/09/the-rise-of-victimhood-culture/404794/