I'm glad the feed store I bought my chicks from is not like those. They have all of the breeds separated and all of the genders too. And when I bought some cochin bantams, EEs, and a mottled houdan(they weren't supposed to be mottled houdans, they were supposed to be mottled cochin bantams but the hatchery they got them from mixed up) that were all supposed to be straight run, I got all pullets. I ended up getting one more blue cochin bantam chick that they thought wasn't going to make it. He turned out to be a very sweet rooster. He died last year because he couldn't preen himself. RIP GG.
I did have a problem once though, but not major. The buckeye chick that was sexed a pullet turned out to be an RIR rooster, and the production red pullet turned out to be a buckeye pullet. My sister had gotten Winter because it looked different from the rest and had white on it's wings, and it had been the friendliest and the calmest, then he ended up being a rooster and being mean, but it was because we were both scared of each other, and since he was smaller and I was scared he took the opportunity to attack me and keep me away from his flock. But now that I am not afraid of him, it's fine. He's actually so afraid of me that if he starts to walk into the coop if I'm in there he will actually back out of the door and not come in until my back is turned lol. So yeah I'm sticking with my feed store.