If you did it to someone in the street or without knowing if they'd be happy with you doing it, yes it would be rude and offensive.
As the person in question was dressed as an alien for a task in Big Brother, I'm sure they would have known there was a risk of 'audience participation' from individuals of somewhat questionable intelligence, so I'm not entirely sure I can get too worked up about it...
As the person in question was dressed as an alien for a task in Big Brother, I'm sure they would have known there was a risk of 'audience participation' from individuals of somewhat questionable intelligence, so I'm not entirely sure I can get too worked up about it...




