The American "left" is soft right wing. These disputes are the right squabbling with the other right. Much of the silencing of the hard right, for "decorum" and such, is not recognized as censure by the soft right. At least the hard right is honest about banning speech.

Because all of the focus is on soft and hard right wing cancellation, anything actually on the left is seen as extremist. Extremist speech can be silenced and, just like with the hard right, not acknowledged as being silenced.