Why do my co-workers think i am snooty?

ok, I work in a blue collar job, I am currently in college. I am neat and presentable, however my fellow coworkers have this opinion that I am snooty. Ok I love to drink my starbucks but other than that I cant really figure out why they all have this idea in their heads. Could it be that i am young smart guy in college and will have a good life ahead of me?