In the UK singing at rugby matches is part of the supporters experience, will they ban Swing Low Sweet Chariot next !!
I was at the world cup in 2015 at the Australia Scotland game. I was sitting amongst a crowd of Scottish supporters wearing my Aussie scarf. Scotland should have won the game but the ref had other ideas and awarded Australia a penalty in the dying moments of the match which Foley kicked and the Wallabies won the game by one point. I of course was ecstatic but never once felt threatened, in fact the Scots whilst furious were great companions.
That's what rugby is all about