This shit is insidious because a section of the left will completely agree with this and take it as a signal that they should do anti-communism within the left "so the right can't say this kind of thing", doing exactly what they want them to do.

"We have to kick you out of the movement otherwise the fascists say this stuff and that makes us look bad!" is handing over literally all control of your movement and the left overall to the fascists.