I have no idea what Neville is like, never met him!
He is a United fan and played for the club he supported! In his playing days he spoke like a fan which is no crime as that's exactly how we and every other fan of every other team behave. Off camera he probably still acts and speaks like he did when he was playing!
But as a pundit he is very professional and impartial! As long as that continues I have no real problem with him!
As a pundit maybe, as a co-commentator he's the still the same snivelling little boot-licker ( thanks Carlos ) he ever was and can't help but get his digs in.