A helpful guide from the University of Wisconsin.
I have trouble taking some of their examples seriously. "That's so White of you"? I read that in a book, once. I have a sense that it was Greenmantle or The Thirty-Nine Steps by John Buchan, though I can't find it in the etexts of either book.
Others are very strange. It's a microaggression that there is an overabundance of liquor stores in "communities of color"? I assume the liquor stores are there because it's profitable for them, so the abundance (or lack thereof) is within the community's control (even lacking zoning laws). Furthermore, what sense does it make to describe this as a microaggression? No one decides to create an "overabundance" of liquor stores: they decide to open one more. If they are misjudging the community's demand for liquor, the punishment will be delivered naturally by the market via the loss of their investment.
Certainly people should be courteous. I wouldn't want to be misunderstood as advocating discourtesy. Still, part of courtesy lies in not willfully giving offense, and another part lies in not willfully taking offense where none was intended.