I wonder if he felt that wearing the mask gave him the freedom to air some genuinely felt rage and mysogyny that is part of his character, or whether the lyrics just stemmed from a desire to sound like a rapper type character?
Either way, I would imagine his mum,along with any other women in his life, must be horrified at the expressed sentiments.
As to whether it should be banned or not- I am no fan of such vile sentiments, but whilst songs and videos of rappers performing songs that glorify killing and mysogyny are allowed, I am not sure that banning this specific output would achieve very much.
On a side note- why is it that many white rappers end up sounding like poor imitations of DJ Westwood, that gangsta rap DJ and vicars son whose own performance voice makes him sound like a pathetic wannabe West Coast US gangsta? They just end up sounding idiotic and puerile.