I've been 42nd street a fair bit and you do get alot of drunk Utd fans, esp at weekends, who start singing Utd songs at the end of the night. (I'm a Utd fan but its lame and pointless tbh). I can imagine if people recognised Johnson and started it pretty intensley, which it probably would have been, Johnson would have gotten pretty wound up. No excuse, but even as a Utd fan I can imagine it being annoying