This is complete lies. Majority of people just ARE, they are not identifying with anything and question about identity is putting them off guard, in a state of complete incomprehension or in stupor. People just don't understand what that even mean. Especially working class people - they do not have time to think about "existentional crisis" and "humanism and what it is to be human". This is mostly prerogative of privileged and/or rich people with a ton of free time, who can focus on themselves more than on trying to live and survive.

In my language (and in most languages I know, except English) there even no such word with meaning "woman gender identity", only "female human" and "female animal/mammal" ones exist, so you can't even explain to people what it means and why it is different. And everyone is saying that explanation of Stonewall as "taking gender role of woman and living as woman" - is very sexist.

Plus majority of people would be non-binary, not "cis", as they are performing both male and female traits. And if take into account GLAAD's definition, then at least half of population are trans, because GLAAD's definition relies on very American stereotypes of masculinity and femininity, while in Asia and Africa they are completely different.

So I'd say only minority of people have gender identity at all - be it cis, NB or trans.