I've read what he's said but haven't watched it.
A lot of people on facebook are saying it's just typical banter. MAYBE between a group of his Derry friends who know what way to take it, it might not seem so bad but I can see how people are really offended by it. It was awful for him to say it and in (from what I've read) such an angry way so I agree he should be punished for it.
We do have a strange way of expressing our anger Shove it up your arse is a well known phrase here
(That's not me excusing him.....just saying some of us do have an awful way with words which is why I can see why some here think it wasn't that bad)
Here too Ells,I've said stick up it your butt /I'll stick up their butt on occasion and couldn't begin to count the number of times I've heard it said by others.However what he said and how he said it doesn't compare imo,his motive takes it to another level.