Honestly, i would quit and burn the bridge. If they can't show any evidence and can't even tell you what wrong you did, why bother dealing with this nonsense?
Furthermore, for those with very thin skins (SJWs) whom see microaggressions everywhere, it's fine for them to use whatever tools are available because the ends justifies the means, as a person, in their mind, is guilty merely for being born with innate identity privilege attributes. SJW behavior is disproportionate retribution combined with stereotyping.