Gaslighting doesn't just happen on an individual level. There are whole communities of people gaslighting other communities. Every one of these tactics you listed I’ve seen (and experienced) being used to deny the life experiences of whole groups of marginalized people, to disclaim sexism and harassment happens to women, racism, and homophobia.

Blaming the victims, by calling up the victims past behaviors, calling someone “divisive” in mentioning the subject, someone claiming to feel threatened because the subject was brought up, or in many cases, just flat out denying events didn't happen the way a person thinks they did.