I happen to agree with the OP that this is a very disturbing trend and how anyone as the one posters insists finds this funny escapes me.

Thomas Sowell, just a few weeks ago said this about micro aggression...

"Word games are just one of the ways of silencing politically incorrect ideas, instead of debating them. Demands that various conservative organizations be forced to reveal the names of their donors are another way of silencing ideas by intimidating people who facilitate the spread of those ideas. Whatever the rationale for wanting those names, the implicit threat is retaliation.

This same tactic was used, decades ago, by Southern segregationists who tried to force black civil rights organizations to reveal the names of their donors, in a situation where retaliation might have included violence as well as economic losses.

In a sense, the political left’s attempts to silence ideas they cannot, or will not, debate are a confession of intellectual bankruptcy. But this is just one of the left’s ever-increasing restrictions on other people’s freedom to live their lives as they see fit, rather than as their betters tell them.

- See more at: Thomas Sowell: 'Micro-aggression' is micro-totalitarianism | New Hampshire

While some find it funny, I find it a bit unnerving that something like this has gained such momentum.

From JULY 9, 2015

Microaggression and Changing Moral Cultures - Commentary - The Chronicle of Higher Education

FROM JULY 10, 2015

University of California System Stirs Up 'Microaggression' Debate, but is it Too Much? : News : University Herald

From June 30, 2015

Wisconsin university dubs 'America is a melting pot' a racial microaggression - The College Fix

To those who feel this is a non serious and even fun thing, I do not know what to say.