Is this a serious question? Maybe people don't want to put their bare ass down on filthy bootprints.

He didn't didn't want to be the SECOND person squatting with boots!

Well that first guy didn’t want to put his butt where other guy’s butts have been, that’d be pretty gross.

Exactly.

People are asses. Don’t assume you know everybody’s history.

Maybe the guy is one legged and has to jump on the toilet seat to keep his balance.

More likely it's someone from India (or much less likely China) refusing to use the facilities as intended.