[notJim]

It's risen by 1 percentage point since 2012 when they started tracking this, and for millennials, the number is around 8.2%. They don't seem to have data for zoomers yet. [1] This would suggest (imo) that 4.5% is in fact a significant underestimate, but I don't know necessarily that it's as far off as 20%

[1]: https://news.gallup.com/poll/234863/estimate-lgbt-population...

[brandmeyer]

Its also important to remember that as humans we tend to vastly over-estimate the incidence of relatively rare things. We tend to think that something happens based on how often we encounter it, without considering the total number of encounters.

4.5% is about 1 in 22. 8.2% is 1 in 12. Even accounting for the fact that most LGBT people are as private about their sexuality as straight people are, its often enough that you're likely to encounter LGBT people on a frequent basis.