I somehow accidentally got body-swapped with Zim's robot companion and was to get banished with Zim, and my sister didn't realize that when making the bet... or didn't care, honestly.

[He and his sister... don't really have the best of relationships.]

I really don't know what they have against Earth. But then again, the Irken Empire he served had that kind of attitude toward all planets that weren't theirs. Any planet that set their sights on either gets destroyed if they don't surrender, or they get turned into a food court or something that suits their wants and needs if they do.