I want to talk to you about two groups - tall people and short people. Usually, short people can't reach items that are on very high shelves.

Above, did I imply something about tall people's abilities to reach items on very high shelves? I didn't claim anything about tall people specifically. But I think I did make a claim about their abilities here, by implication, given the context. It's natural to infer the claim - this is just part of how people communicate. The claim is strongly implied - tall people can reach items on very high shelves.

I believe OP's clarified claim (of people in AP CS classes, most are men; of people at summer coding camps, most are men; etc), rather than OP's initial claim (most men take AP CS classes; etc). The clarified claim seems accurate. The initial claim is clearly inaccurate - and OP "stand[s] by it 100%".