I have been under pressure on many flights, but I have kept calm throughout
And your point is?
Overload doesn't necessarily manifest itself as panic. It's possible to appear quite calm, and think you're behaving quite rationally, but miss things, musunderstand things, not be able to take in everything, etc etc. So your statement above is actually totally meaningless.
And even if you're right, and you do cope well with such situations, what on earth gives you the right to criticise someone who can't? Take it from me, you don't sound like the perfect pilot. You sound like someone with little understanding, either of yourself or anyone else. Someone who needs to grow up! And if it wasn't for your very young age, I'd be considerably less gentle with you than I am, since I'm heartily sick of the blinkered, holier-than-though, aren't-I-wonderful, super-pilot image that so many people on this forum like to project. Oh, for some normal, average, human beings, made of flesh and blood like the rest of us!!!!!!!