Oh man that's not right! They should leave their issue with Jeremy between them and not let it affect you.
I've been thru the same situation, but with a movie rental store. 2 years ago, I went there with my now ex bf and he got into a fight with one of the workers there, and made a huge spectacle by knocking down several movies from the shelves and now, even though I am not with that guy anymore and they still won't let me rent movies there. I love that place because you can rent a movie at regular price and the 2nd or 3rd movie for 5 cents each on Tuesdays. This particular store was like half a mile from my home, now I have to drive 10 miles to the other store. It really pisses me off. I told the manager I'm no longer with that guy and he said he didn't believe me and that we (his own words deaf jerks) are full of BS. I told him well now he's lost a customer and several others because I told my other friends about it and now they won't go there.