You are so right !
About the relative IQ thing. I just got back from my trip. I lost.
Anyway, a ploppy wanted to double down an A, 8 vs 6 and people were telling him "no, you don't want to do that" and all this riff raff. Actually, it was the correct play. He ended up doing it and I ended up losing my big bet. He had $5 out and I had about $150 out. Afterward, the dealer started scolding him for it. He pointed to my bet then to his. He is betting this and you are betting that. I stepped in and said "no no no". I told the guy to play however he wants to. The guy was making some decent plays. He wasn't counting, though because his bet never was bigger than $5.
On my 4 day trip, I saw so many dumb things that I soon became kind of irritated. It wasn't the dumb blackjack plays but the way people were treating each other. One guy made the comment "I was doing alright until these two jumped in" pointing to me and this older fella. I said, "You aren't blaming me are you?" He shook his head. I normally wouldn't have said anything but I was getting fed up. I was also losing.
This other pimp-looking guy in a very bright red suit and bright red hat started pacing behind me saying "I hate it when fools jump-in in the middle of da shoe. I hate it." He repeated that about 4 times hoping I heard it. I stayed and played even when the shoe was negative just to spite him.