I’d want to know what he was actually doing in the streets?
If he was in his boxers and trainers, he’s not actually dressed that differently to being out on a boiling summer day in shorts/trainers or flipflops. In the street? On the beach? In a park with his top off at a festival? Was he actually exposing more flesh than any of these more acceptable things? Is it just because it was boxers not shorts?
If he was screaming down the street, staggering into old ladies and humping lamp posts, that’s probably different. I have seen teacher friends pretty lairy walking home from the pub before-being quite loud and giggly and one walked into a lamppost! I would hope they wouldn’t be sacked.
Abusing a paramedic so badly you get a police caution which you don’t then disclose to your employed is clearly serious.