Do what you think is right for you and your friend.
I've got friends I've known for many years--more than 40 years with some--and I haven't fished with any of them that don't practice C and R or who are really selective about what they decide to keep. We're still friends, we just don't fish together. They fish where they can do their thing, and I fish where I can do mine. We have beers, play pool, etc., but just don't fish together. It's the same way with politics. I have friends at the opposite end of the spectrum from me. We stay friends by NOT talking politics. Really simple.
As far as taking somebody with a catch and konk mentality, they'd not be seeing those big browns, nor would I give directions to them. I also agree with others who say if you must fish go to a place that killing is legal. It's too much of a draw to kill big fish even if you aren't in an area that allows it. You wouldn't want a warden to track him down for keeping an illegal fish, eh?
Oh, and I have no objections to somebody legally catching/keeping fish. I just generally wouldn't be with them.
"Should you cast your fly into a branch overhead or into a bush behind you, or miss a fish striking, or lose him,or slip into a hole up to your armpits-keep your temper; above all things don't swear, for he that swears will catch no fish."