How is that different from calling for a boycott though? Neil et al. are as likely to complain about “bullying” or say “the liberal elites are laughing at you” as they are go on about wokes cancelling them.
Because you're not aiming to fight the converted. You aren't going to convince the tinfoil hat wearers who already want to listen to this stuff to turn away from it. The aim instead should be to stop more falling into the trap of thinking such a thing is a reasonable viewpoint.
Sociologically speaking, it's called normalisation. 'Cancel culture' makes them sympathetic to a wider audience and therefore drags more into 'the net'. Simply arguing and logically highlighting their inconsistencies/insanity through what they actually say or do is much more preferable as it can't be leveraged.