Because Palace use one it is now a tradition not to :shrug: Hopefully the new generation of supporters will see beyond their noses instead of being so anal and precious about it.
I haven't got a problem with a drum but the problem is fans objecting to it because Palace use one. Doesn't matter that loads of other clubs use one, it's just because Palace do.
It's the same as the Saint Pauli "We love you" song, because Palace sing it, we don't, even though it's not their...