To steelman him for a sec -- just as it's good to call out your own team when they do something wrong, it's also a virtue in many people's minds to acknowledge when the other side does something good. You can say the rules are different if the other side are fascists and we just have to punch them, but (a) I don't think that it was clear to everybody in the first weeks of Trump's presidency exactly how fascist things were going to be (this was when he'd gotten ceasefires don't forget) and (b) I still wouldn't consider it a cancellable offence either way, even if it's misguided liberal behaviour.

Anyway, such behaviour tracks with being a liberal, and I'm not at the point yet where I'm wanting to cancel people for being liberals.