Is it insulting that my "friend" introduced me in this way?

[Scott]

One of my "friends" last year planned to room with me almost all year and took advantage of me a lot.. I helped them with homework and stuff, and I felt like I was only being used as a last resort to hang out with. They decided to not room with me and not tell me until the night before roompicks and so that put me in a really bad situation. He's now ignoring me now that school started again.. his girlfriend came by with her friends and he introduced them to everyone but me, only asking me where other people were, and when I asked him not to be rude, jokingly, he introduced me as "my old roommate." Is this insulting? That he introduced me this way and not as my friend only when I went out of my way to ask him to be polite?
And yes, I know that the previous stuff is rude, but I am asking about how he introduced me specifically, with the circumstances, is that rude?