That I am not so sure about. It is most often seen in the class room relating to class topics with certain topics causing discomfort in students. Trigger warnings are especially irritating as most of the students think being triggered is if something makes you feel really uncomfortable like say the subject of rape and they don't realize there is a difference between that and the reactions of actual trauma victims (of which about 80-95% of students aren't).
Micro-aggressions certainly do exist, but they tend to be more mildly offensive such as asking a Chinese person where they came from, with the (potentially fault) assumption by the Chinese person being that the person asking the question is assuming they were not born in the US.
I doubt very much that any of it has to do with school shootings. Those things are more often related to undetected mental health problems, the individual feeling isolated or excluded, easy access to firearms (or bomb making material), potential religious beliefs and/or extremism, and the amount of media attention placed on these events.
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