How about this: when another MAC EMLPOYEE is jealous of you?! Now THAT pisses me off!
Similiar to lilmamaj, I was hired for the company with no (professional) cosmetic experience, but a LOT of retail experience, and a passion for MAC as a company, they saw that in me and after a few interviews offered me a permanent position at a MAC store which apparently never happens here (I would've had to freelance first, then work at a counter, than a store, etc etc) Now, I'm not a rocket scientist, but I can smell a person's attitude from a mile away. One particular co-worker was really nice to me for a few weeks, and then out of nowhere would barely say two words to me. It was another coworker (on the downlow) that informed me that same girl was probably a bit jealous of how she started off as a freelancer and had to work her way up, and yet I did not, almost as if she was implying the job was just handed to me and I didn't have to work for it. I thought to myself, how unfair is that? Maybe she should see that as something she can work on herself, don't hate on me just because I have a passion for something and they believed in me enough to want to hire me, and how can you assume that I haven't worked to get my job! UGH! Never in my life have I ever really had a problem with a coworker, I don't say much to her anymore, I just keep it at a professional level.
I also found out that she was going around telling other co-workers how I make youtube videos, and she didn't like the fact that people trust my opinion as far as makeup goes. After I heard that, I was pretty much done with that girl. God gave me this job, can't nobody, not even some jealous heffer take that away from me!
I know this was a little different from your situation, but my point is, when people come at you foul like that, just think in the back of your mind how lucky you are to have a job some people would kill for!