The strategy here is to make Harris seem shrill and unreasonable.

The idea that calling out bigotry as unacceptable can be ‘shrill and unreasonable’ is so ridiculous that I want to disbelieve you, except that I know enough about the world to know that it happens.

You can post online that you’re upset that Israel is killing innocent people, and be told that saying that is ‘Russian propaganda’ etc. Anything can be spun as unacceptable, I guess.