My Friend Made It Super Awkward

My friend and I were in a crowded store waiting to checkout. After about a minute standing in line, he gets bored and starts to whisper something in my ear, but I can’t hear him. He then proceeds to smack me on the ass as hard as he can and yells out, “NO ONE TOUCH HIM, THIS IS MY MAN!”. He then just walked away and grabbed a drink from the vending machines outside while I stood in line, getting glares from everyone.