- "by definition, PoC can't be racist" - e.g. as an argument to shut down complaints of "reverse racism"
- white people must listen to PoC's before they can engage in discussions about racism (e.g. - don't force PoC's to engage in the emotional labor of educating you)
- you can't make assertions about the experiences of PoC/women/trans/non-binary people if you haven't lived as one
etc.
I'm not making ANY judgements about the truth/validity of the aforementioned "rules of engagement".
I try to follow these rules when talking about social justice issues. It's no skin off my back - but it certainly adds some limits to the types of conversations I'll participate in, and the kinds of things I might say. I don't think there's anything wrong with that - as long as I don't slip into outright dishonesty as a result of these constraints.
I think some of the backlash against social justice by conservatives comes from the belief that these kinds of constraints are unacceptable, and are concocted by stupid, illogical people.
Free speech kills bad ideas. The nazis, for example, have free speech in the US. They get nowhere.
I'm racking my brain trying to think of counterexamples of suppression from the left. Suppression of white supremacist thought? Anti-gay sentiment? The value of diversity? Who on the left is genuinely (if secretly) afraid that whites are the master race, or that the gays are destroying family values?