That's where the selective part comes in. They only crow about how racist the flag is when they can use it to shut up people they don't like. They won't say anything about it otherwise.

And clearly they haven't gotten tired of it yet, they've just double downed on it over and over again. Calling things racist at this point is the entire foundation of the progressive movement. If they didn't have it their ideology would fall apart. It is nearly their justification for everything. Unfortunately it still works.

Being called a racist used to mean something, and being a 'racist' used to mean something. They were shunned by society because their views and actions were abhorrent. The left has been abusing that societal impulse as a political tool for years and now they apply it to everything. They'll call you a 'racist' for waving an American flag because one guy they didn't like somewhere did it and they still expect society to treat you like you were burning crosses on somebody's lawn.