Majestic, thank you for asking. I think the other posters have explained it all very clearly.
As I mentioned upthread, I associate the rainbow and LGBT+, or Q, or whatever, with Stonewall and Pride. I used to be enthusiastically involved in both.
But now both have redefined lesbians by gender instead of sex, so people who identify as women (at least some of the time) & who are attracted to other people who identify as women (at least some of the time).
Which means that men can be lesbians if they identify that way, & those of us who object to the idea that lesbians can have or be attracted to penises are bigots. Very luckily for me I came out a long time ago, but I’ve listened to young lesbians who have been almost in tears over the pressure to accept dick from the very people who ought to be supporting them.
Lesbians who protest at Prides or at Stonewall conferences about that idea (me included) get the police called on them. Women who want intimate care from HCPs of their own sex, or single sex toilets, wards, rape shelters etc, get called transphobes or TERFs.
So there’s that. And there’s also Stonewall’s support for the idea that gender non-conforming children, many of whom would otherwise grow up to be lesbian & gay, should be encouraged to take puberty blockers (eg Lupron) with all their side effects, & then once old enough, have surgery on their prepubertal genitals.
Stonewall justify this with faked statistics from a flawed survey. The kids will sterile, never be able to have a fulfilling sexual relationship & be on drugs for the rest of their life but the rainbow community don’t care about that.
I’m definitely not saying that everyone who wears the rainbow is homophobic and misogynist. Of course not. I’m saying that those are all the associations I have with it. Working in Central London during Pride month was hell.