yeah but crowd singing over it is ridiculous all the same. It's one of those situations where something unfair is occurring and to retaliate you do something equally unfair, and it's complicated, a big mess, and you find yourself doing something silly in the end that's not intelligent or redeeming.
These guys come in, do the haka; as a player you have to stand there and watch, possibly farting (provided they hear you or the cam catches it) gets you in jail or at least a heavy monetary sanction; but then if a crowd of 83 billion sings over 20 dudes in short shorts ehhh, you're not exactly replying in kind or in a way that is even in the most bizarre universe "fair".
I'd imagine 20 dudes doing a performance, and I just play Cannibal Corpse at 300dB just to, ooh, show my presence...very big, much intimidating...you may not agree with the haka but doing something so utterly stupid in turn doesn't fix the situation or add anything valuable. Plus it's a complete sheep herd mentality instance where the people don't think twice and hear chants nearby and join in by yelling, just because, "we have to defend our house, yay", well done.. which I find the opposite of noble and intelligent or just the right thing to do whatsoever.