Please rescue me from immature people.....

It's one of these flights again, where I meet immature and argumentative crews. Sometimes I wonder where my patience comes from or should I ask how can we recruit such people!!!! After becoming a manager, I always asked myself if I was that pain in the a** as a crew. I remembered when I was a crew, whatever my senior says I just acknowledged and apologized, if I did something wrong, and if it's something I didn't know about, I will be glad he has taught me something new.
But here, even with Safety Manual - black and white - pertaining to safety, just to speak out their thoughts, he will go " Yeah I see the point ( in the book) , but I'm very confident about my thoughts (which is against the safety manual)" .......What the Heck???Does it make them happier by speaking their thoughts, even if it's wrong. To me what is written in the manual, you just bloody follow. I don't WRITE THE MANUALS OK, the company does!!!!
You can very much tell which bangsa will behave like that......Gosh.....I just feel like jumping out of the plane, if I could!!! No wonder all the Cabin Managers become cuckoo....thanks to these children.....please remind me if I do ever turn to a cuckoo Cabin Manager too, but at least you will know the cause of me being like that.....Sigh....