I might suggest a fifth item for your list, which has to do with whether you, as a non-minority, are appropriating something that a minority has been given a hard time for. For instance, a number of Black hairstyles have been denigrated for generations, leading to people having to deal with damaging, toxic, expensive, time consuming chemical treatments to achieve more culturally acceptable hair. So when non-minority people wear cornrows or dreadlocks to be trendy, especially while Black people are still being made to feel uncomfortable (or being discriminated against) for wearing the same styles, that can sting in a different way. This isn’t limited to cultural characteristics, but it’s a sensitive aspect of appropriation that includes cultural stuff.

That explains why Trump had his doctor release an open letter saying he had a 2cm hole blown in his ear

It’s still true. It’s not that the majority of these people are actually thinking, “How can I make the world worse and make the greatest number of people’s lives bad?” Rather, they’re under the impression that others (probably you) are saying that, and worse, that Trump is somehow their best defense against it.