Can a casino punish you for outplaying a game to beat them?

I use to always get a comp room at a casino. The last time I played, I was playing craps, and I play craps in such a way that I am guaranteed to win. The dealers always get mad at me for placing the bets and I just pretend that I dont speak english. Now I do not get any more comps and I play a lot of blackjack and other games, which gives me a lot of comp dollars. My friend who plays less than me gets more comps, so is the casino trying to punish me since I play a conservative approach that will guarantee me winnings?