Just to add on to this: even ignoring the SegWit incompatibility, ASICBOOST has real downsides. ASICBOOST incentivizes miners to do things like drop transactions or even create empty blocks often, delaying transactions and going against the reason Bitcoin has mining. If it was discovered as Bitcoin was being created, it would have been fixed like any other bug. But now, since it's being used by people known to be very anti-SegWit, some are politicizing the issue as if wanting to fix ASICBOOST is just a petty attack by (pro-SegWit) Core.

Then add on the possibility that the anti-SegWit movement might have been spawned or funded by people secretly using ASICBOOST who had no true philosophical positions about SegWit or the good of the Bitcoin network, and things are looking very... shady.