I really like what Elaine said about trying to give people the benefit of the doubt: "Never attribute to malice," in other words, "that which can be better explained by thoughtlessness." Robert Hanlon
I also agree that coworkers should (along with friends, parents, and people as a whole) treat us kindly and respectfully, as we would prefer them to do, but does it follow, on account of this, that they must?
And lastly, at the end of the day, why does it really matter so much what they think? After all, they're humans just like you. Why is it not more important what you think.