"Don't mess with a drinker" joke

This couple walks into a bar: The man goes of to the bog and leaves the women standing at the bar. A bloke goes up to the women and says, "I really really want to squeeze you tit's. Will you let me?"
The lady turns around and says, "How dare you, get away from me, you sicko!"
The bloke then says, "Oh you have a lovely arse can I rub it, please let me?"
The lady turns around and says, "Look you pervert get away from me! I'll get my boyfriend to beat you up if you don't piss off!"
The bloke takes no notice and continues to the woman, "I want to tip you upside down and fill you up with beer and down it in one big gulp."
"RIGHT... THAT IS IT" shouts the woman.
Just then her boyfriend comes out from the bog and says, "Whaz goin' on here?!?"
The woman says all hysterically, "That bloke over there said he wants to squeeze my tits!"
Her boyfriend rolled up one of his sleeves and was just about to smack him when the lady shouts "That's not all, he wants to rub my arse!"
So her boyfriend rolled up the other sleeve!
"And do you know what else he said? He wants to tip me upside down and fill me up with beer and down it in one big gulp! So are you going to beat him up then?"
Her boyfriend rolls down his sleeves and says "Of course not darling, I ain't messing with a bloke that can drink that much beer!!!"