I agree with Tekobo. It's one thing if you're being paid, then you should cater to the client, even if they have bad taste - it's their money after all. But, if you're doing it as a "favor," then don't pander to these fools and cook them bad food because they don't know any better. My advice, cook the tri-tips to medium, as they should be. If folks complain that it's "raw," then show them where the microwave is and say "have at it!" Then, it's completely on them when they screw it up. You never know, you might make a convert or two on what meat is supposed to taste like, versus a hockey puck! Which, by the way, would be an awesome way to present them - cook a couple of tri-tips to well done, plate them along with a ring of hockey pucks around the exterior of the platter!