I think one of the Biggest questions they can ask themselves is this: Would I be willing to leave a marginalized person alone in a room with the person in question? Can I leave my transgender, Indigenous or Black friend, SO, boyfriend, girlfriend alone in a room with my aunt, uncle, or racist cousin? Would I feel comfortable doing that?
If the answer is no, then the question of why needs to be asked next.
There are a lot of people out there who don’t consider themselves racist, and they’re probably not, but will not think twice about bringing their significant others (who live along marginalized identities) into the presence of people who will emotionally harm and disrespect them.