First, the term "ally" is reserved for people you are working with in a militaristic situation but whom are aliens. You don't call people from the same group as you allies, you reserve that term for people who are from a different group.
Second, the double standard between Christians and Muslims (often held by people who consider themselves to be "Muslim allies") exists because the Muslims are preemptively a different group, so what they do is none of the white liberal's business or concern. In contrast, the white Christian is a part of their group because they are white so they can be very concerned about what the Christian does, even if it is basically a less extreme version of the same behaviors.
Third, liberals are increasingly for segregation because as the above two points show (and as the fourth will also show) they assume that different groups are not only separate but that they should be separate.
Fourth, cultural appropriation is a term for when someone uses things that are attributable to another culture. This could be as simple as a white person making a burrito; the real problem in their minds when a white person culturally appropriates a burrito or so-on is that said person assumed there was no difference between their group and the other group.
So in a way, liberals presume a level of racism (and a militaristic relationship between the races) that a conservative who will eat burritos and so-on does not.
I really believe that in a different environment, most of these Anti-Fa would have been Nazi brownshirts and so-on. The difference between conservatives who are supposedly conspiring against them due to their regressive beliefs and Jews who were supposedly conspiring against people over their regressive beliefs is that Jews were arguably an ethnic group but a conservative is not an ethnic group. Using today's semantics that would make singling out Jews wrong, whereas conservative's willingness to cross sometimes arbitrary social lines means they are not an ethnic group and can be targeted without it being "racist". Thus we end up with things like "black white supremacists" and so-on whose real crime is not racism against blacks, their crime was having presumed there was no line to be crossed.