Anyone can do a search ON HERE and find it being used - and long before anyone thought Trump would run for President.That's because it's a pretty common phrase. People have been calling, say, the Middle East a shithole for as long as I can remember.
Are people still discussing this?
EDITED TO ADD: And the same search would show how REALLY OFTEN the phrase is used since Trump took office - about a dozen, and about half of those are IN THIS THREAD. And all of them in 2019. Hardly a flood.