Is it wrong to not play by the book if its winning you money?

The other night my two roommates and I went to the casino and all sat at the same blackjack table (they only allow 3 per table cause covid). I managed to win a couple early and decided to start hitting on hands i am not supposed to, however it was working the majority of the time. My two roommates were pissed at me as they were losing money but since I know how much money they have compared to me, I just sat there and laughed at them. But thinking back, if they weren’t roommates and instead a couple of random people, I think I woulda got beaten up leaving the casino. Is it a bad thing to not play by the book if I am winning by doing so?

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