What's the common standard then? Does it ban leaders of countries that oppress homosexuals and other minorities as policy? Leaders who actually imprison political dissenters?

Donald Trump is a bad president IMO, but there are far worse people (and their spokespeople) active on social media. The inconsistent standard makes this seem more like virtue signalling, which isn't quite "giving a shit about the state of the world".

EDIT: Corrected a typo. I think Trump is a bad president.