The Atom is Often Looked Down Upon.
I should have mentioned that All Star Comics #3 is the first appearance of the JSA. It’s not an actual team adventure, really. The JSA is portrayed as more of a “social club for heroes”, with them all sitting about, telling stories. What’s interesting are the below two introductions:
A few stories later, we have this:
Either Al wasn’t paying attention to the Sandman’s introduction, or he’s thinking
“Yeah? You at least have a gas gun. My shtick is that I’m short. Short and dressed like some kind of midget luchador!”