Jessica, I've never done one of these gas station shops, but I've read a lot of anecdotes from others here regarding their gas station shops. Seems like a lot of these managers / owners can come across like the convenience store manager in the David Lee Roth "Yankee Rose" video (I know you have no clue what I'm talking about, but I think it's a good parallel so I'm using it). IOW, controlling, manipulative, rude @#$%&. Don't let it phase you. Just remember you're supposed to be there and complete your task.
I don't think there are any Russians / And there ain't no Yanks
Just corporate criminals\ / Playin' with tanks