I've been running IDPA matches and the training at the local sheriff's range since the late 1990's. I always get the giggles when the guys that don't believe in press checks step up to the line, rack their slide, then get that "click" when they pull the trigger because the slide didn't pick up a round out of the mag, usually because the mag wasn't perfectly seated. Usually happens at least once a month.
First thing they always say is "That never happened before!". They all believed that it couldn't happen to them.
Some people just learn slower than others (or never). There's a reason that there's old sayings like "You can lead a horse to water, but you can't make him drink".
But don't worry about it, I'm SURE that it will never happen to you!