It isn't at all a no true Scotsman argument, what are you talking about?

You can be a leftist and not be bigoted. Bigots also join the left, we can't help that, but that's because they personally are bigoted, not because the ideology is. In fact, most modern leftism argues that bigotry is fundamentally at odds with the core ideals, and in my experience a majority of the left, at least in English speaking countries, wants to distance these people.

You cannot be a fascist without being bigoted. Being bigoted is part of the ideology. It aims to spread and teach bigotry, that's the purpose of it.

No true Scotsman would be "yeah but the anti Semitic leftists aren't real leftists", which isn't what anyone said.