I was at the table when this happened. The guy was a donk and had done plenty of questionable things. Maybe you hadn't been there long enough to see them, but folding was terrible. When you folded, I figured you must have had A-K or J-J or something and just didn't want ot risk it. Unless you have a solid read, I think you call this just about every single time. And against this particular guy, you should have called.