I'm from the "street", and come from a working class background.
Me, and everyone I know, fart in each others faces whenever we've got one brewing.
To be frank(spencer?), this just shows how un-working class he really is, if he thinks that's what working class people do all the time.
Maybe a few in their teens or twenties might do it now and then with their mates, just for juvenile laughs.
But not as normal casual behaviour, and never in a girl's face.
He's completely clueless.