I'm actually pretty shocked Boris is going down over what he is for. These sandals sound so minor in comparison to everything from the Trump Administration...a reminder other countries actually have some standards.
I've come to believe that there is effectively no bottom for a US president, short of, say, actually shooting someone on camera on 5th avenue, so long as the president in question is sufficiently stubborn and shameless in their excuses. At least as far as Republicans go, considering Trump essentially put that theory to the test.