What is "playing the angle" and why is it undesirable?
It's basically trying to win the pot, or save a bet, on technicalities as opposed to the merit of your hand. Doing something like this is just plain bad public relations. Poker is as much a game of public relations as it is of cards and
odds. You won't have a game if no one will play with you.
Putting the other players on edge, pulling them out of their comfort zones, also louses up the game for everyone else, even if they aren't involved. The vast, vast, vast majority of Poker players are no good, they
know they're no good, but they play for pure entertainment value. If they lose, they write it off as an entertainment expense. They still had fun in a nice, quiet setting, unlike the raucous Crap pits, where pretty girls brought them drinks, they got to see the Big Game with friends, they shared good conversation. Unlike going to the movies, they also had the chance to come away with some extra walkin' around money.
When it becomes no longer fun, maybe they decide to try their luck at the
blackjack tables, or they decide it's time to head for home, or they lose that
gambling spirit and stop splashing so many chips into your pots.
Rec-fish don't care all that much if you become known as a winning regular, and that they don't stand a chance against you. They can still get lucky, they can still bink their two-out
hands after making massively -EV calls. Pots go to the best hand, and there's no consolation prize for playing smart.
and they get to brag to all their friends about how they took down the local pro. Never mind that they'll lose it all back plus a whole bunch more in subsequent visits. That they can sometimes stack the superior player with lucky suck-outs is what keeps rec-fish comin' back.
If you get the reputation for unfair, questionably unethical play, borderline cheating, they aren't gonna want to play with you.