It's unlikely that there's anyone out there who wants to look like the character of Gru from 'Despicable Me.' Unfortunately, though, male pattern baldness happens. Medical science hasn't yet advanced to the point where it can be prevented.
Just going bald won't leave you looking like Gru. People will only be a resemblance if you pick a wide, striped scarf, and wrap it around your neck just underneath your jawline. Either this guy is a big fan, or he's never seen the film, and he's completely oblivious.