Easah Bee;; I bet it that guy was messing around. A lot of my guy friends do that, mess with peoples heads I mean. They say it's dead easy to rattle foreigners. It's kinda funny too. Just childish pranks.

But hugging your mom is perfctly okay! Heck it'd be offensive if you didn't (well not really).

PDA go as far as a kiss on the cheek I guess.