The more I write, the more I'm afraid of the potential apocalypse that will occur if Remnant and Earth will ever crossover. I don't know what I can do. I'll think of something by then, if then.
This is a different kind of topic. While there is discrimination of Faunus similar to the Civil Rights movements, but we haven't seen a lot in the show. I then thought about the discrimination between Remnant and Earth. What I mean is that with the right motivation, there could be tension between both worlds. I'm going to give certain ways that Earth and Remnant could potentially be at each other's throats.
Earth Discrimination
Earth's fear would be a huge contributing factor to this. The fear of how anyone from Remnant could turn out to be our definition of a superhero, how the concept of war would change with Dust. Huntsmen would be avoided by Terrans by the fear that they could accidentally kill them. The White Fang could also scare people by how any bad actions are done on Faunus could be used by the group as fuel against Earth. I'm also willing to bet that some people will also consider the other world to be not human based on how we would be from another planet compared to Remnant and vice versa. The Relics would cause some fear by how Remnant has these weapons that could very well kill millions if gotten to the wrong hands, which could leave into a war for the security of the Relics and who would protect them.
Remnant Discrimination
Remnant could possibly pick up forms of discrimination that we have picked up, but I do have the belief that the color of one's skin or the attraction to sex, only focusing on Faunus. This could change when Remnens see the types of discriminations and even methods of protest we used in the Civil Rights Movement and morph into Remnant culture. I also believe that the inclusion of Earth would leave a distaste for certain people for anything having to do with Earth and may turn violent. Nuclear weapons would also be an issue of fear to Remnant by how if we could use them for any little issue and the greater threat of Salem getting her hands on those weapons. Those can cause territorial and political struggles like no other.
In the end, there will be tons of variables to discrimination, like our history and our actions today. I can't fully predict everything that will happen. Maybe I could wrong about everything and both worlds could get along fine or I'm right and everything will turn to hell.
I'll do anything within myself to make sure that will never happen, though.
Sorry if updates are a little slow, it's just that I'm planning several projects that are big and I have been planning for my future and stuff. Still want to finish my stories before college, though.
Have a good Day!