[@Peridot][@BrassOtter] Now, an interesting thing to ponder is: are gems mainly considered second-class citizens in Crystalisis? Like Otter said, we have gem mutants and perhaps some un-corrupted gems coming to the surface to suddenly be introduced to this huge host of humans learning all these things about their alien race. Also, Kids now pick on other kids for looking like gems: Gem = derogatory term, correct? Not to mention that a kid's [i]parents[/i] could very well be giving them ideas for insults based on the 'lower-class' and 'strangeness' of gems they discuss at home. Furthermore, it doesn't really help an alien race's image when they have marks for 1) mutants coming out of the ground and 2) ancient damage that may have changed Earth forever, even if it wasn't specifically put in text books. 
            As well, you can also take into consideration Crystalisis social, political, and town structure. Beach City was a small town with many of it's citizens having lived with Gems their whole lives, much like Crystalisis, but the city is [i]extremely[/i] small and [i]extremely[/i] lax politically. The crystal gems and Steven could very well make up a good 2% of all of the inhabitants there, and thus, a lot more people get to know them and do buissness with the aliens. Crystalisis, on the other hand, is a sprawling metropolis that needs a stricter political agenda in order to deal with crime, population, etc. Say some bureaucrats see a glowing green man in the middle of town shooting lasers: with that strict political and, perhaps, social viewpoint in place, it could very well be assumed that Crystalisis and it's leaders are going to think him a threat. Combine that with un-mutated gems being a minority, corrupted beasts a majority of a minority, and a larger population to provide bullies: You have a good mix for racial injustice.

[center][i]So, who wants to start the Gem Civil Rights Movement?[/i][/center]

EDIT: Thanks for the welcome, [@Raijinslayer]! I'm so excited to roleplay with you and everyone else.