feed those non-believers hamburger, keep the roast at medium rare for the real eaters
I refused to cook steak for my MIL years ago because she turned up her nose at a rib eye cooked to medium well as being too raw ... I had overcooked that one just for her, the rest were medium rare. She wasn't amused when I took her plate (she thought I was going to put back on the pit) and returned with a hamburger patty in it's place.