Seems to me there are two totally different genres here.

1. The football song, sung by genuine soccer fans, and often well crafted and well sung. These I would regard as a valid folk subset, in the contemporarary class.

2. Generally mindless, repetitive (and often offensive) nonsense, performed by soccer hooligans, usually rather badly. These I would suggest belong in a category I think of as Chants Redundant and Puerile, or C.R.A.P. for short.

Don T.