Blackadder
Brighton Bhuna Boy
The chant is sung against the almost entirely straight Albion fan-base, as a wind up and attempted insult, in the same way that Albion fans sing against Pikeys, Northern b's, etc
There is no evidence that 2,000 Millwall, CP or Cardiff fans singing this, in any way, want to harm homosexuals. It is entirely a chant to wind up especially the 'macho' Albion fans who are in turn singing against the opposing fans.
This is entirely different from chants aimed against an individual black person, which few would condone.
I don't think Cardiff fans actually sing anything. Regarding Millwall. Think most of them actually believe it.