Game changing (and therefore probably futile) suggestion:

[#M|A#Wolf]

Just train more weapon aiming and I guarantee you'll see later that you won't even be getting angry by the dancers. Also realize that when they do that, it helps them dodge the bullets, but shooting you while dancing is hella hard, so since they can't shoot you while doing that, take that as an advantage and take your time to kill them; specially if you have AR or SMG, instead of holding the shooting button trying to shoot them there, tap it to shoot 4-5 bullets per click.