Harmless stuff.
It doesn’t look as if they are loud an boorish in an intimidating way like football groups can be in tne tube. The vibe is not ‘phwooar missus get an eyeful ‘ or stag night antics.
It’s in a Sunday, not rush hour Monday when everyone is pressed against each other.
Men without trousers are absurd and comic rather than threatening (unless looming out from behind a bush as a flasher) , hence so many spotty boxer shorts Pythonesque scenes in sitcoms when a man is seen in his pants.
I am amused by the pics of bare knees along the tube carriage.
Let’s not moan about ^everything* just because we are too sensible to take part.