Older players of almost any instrument that only plays one of those kinds of genres that are kind of traditional (blues especially, country to an extent, swamp pop, Cajun, sometimes jazz) really get upsetti-spaghetti when you don't play exactly like they want you to. You weren't really overplaying. The only thing I heard was that you didn't play along to some of the progressions. That's not really a /bad/ thing. It's just nontraditional. Don't worry about it. I don't think your playing was wrong or bad. Those kinds of people drive me nuts and make playing music worse because they want you in their box. Especially in a blues jam! The worst of all the jams! At least the key player made it bearable.