The "LGBT" is a big umbrella. Lots of heterosexual male people now claim they are lesbians, and sometimes their wives and female partners claim they are now lesbians or bi too as a result. Lots of same-sex attracted young people are claiming to be trans so they can identify out of being gay, lesbian or bi yet remain under the "LGBT" umbrella. And lots of straight women who want to appear edgy and with it and "included" are "coming out" as non-binary and "queer." Like Jamila Jameel, a bog standard straight woman whose partners have alway been men who claims she is "queer."

Finally, a lot of young people "identifying as" LGBTQ today have had little or no IRL sexual experience, much less relationships. Many have not even kissed someone else in a sexual way. They're just adopting labels, labels that might - or then again, might not - be consistent with their actual sexual orientation and behaviors once they start seriously figuring themselves out and getting some actual life experience under their belts.

And even if these young people did or do have some same-sex sexual experience already, it doesn't mean they are necessarily "LGBTQ." It's always been quite common for kids, adolescents and college/uni students and young adults to have same-sex sexual experiences in the process of growing up. Doesn't mean everyone with these experiences is really bi, gay or "pan." The way people live their adult lives past age 25 into middle-age and the senior years is much more indicative of their actual sexual orientation than the exploring and experimenting they did in their formative years.

Finally, many young people's sense of their own sexual orientation gets thoroughly screwed up because they were sexually abused as children and adolescents, and/or are currently in a sexually abusive or coercive relationship in early adulthood. Some people who suffered CSA, ASA & EASA assume that because they were sexually abused by someone of one sex as children/adolescents/young adults, it means they are naturally oriented towards that sex. On the other hand, some people go in the opposite direction, reacting to being sexually abused by members of one sex by rejecting the idea that they might ever feel any attraction to or want sexual involvement with members that sex of their own volition in the future.

The upshot is that especially when it comes to people under age 25, what they tell pollsters, report in anonymous online surveys and say on social media has to be taken with a grain of salt. Or a whole shaker. Much of the supposed big uptick in "the LGBTQ" that is said to have occurred under Trump is based on what people 18-24 told a recent Gallup poll and on surveys and claims made by "LGBTQ" campaign organizations.

EDITed to add: what anyone of any age tells pollsters or reports in surveys about their sexual orientation and sex lives, as well as most other topics, needs to be regarded with skepticism. People lie to themselves and others all the time about all sorts of stuff. To get a sense of how prevalent being "LGBTQ" really is requires much deeper digging into what actually people do, the kinds of behaviors and relationships they engage in, rather than just taking note of what people say and what identity labels they've decided to adopt. The "identities" people nowadays claim or invent often have been chosen to set themselves apart from - and above - the rest of the population, whom they assume to consist of people who are mostly straight, "vanilla" and dreadfully boring.