Raleigh wrote:
If you're just wandering aimlessly around a bar area that would look suspect, like you're looking to steal something or trying to leer at girls, whatever.
Even if you're completely innocent it still looks weird to other people.
Your behaviour probably made him feel defensive rather than offended, as he's now warning other people about you.
Maybe he was an undercover policeman. Defensive or not he’s still a major prick.