No, it's mainstream pop culture. As the author alludes it's trendy even for straight people to emulate gay culture.
IMHO part of the issue is that America isn't a single culture. There's a big difference between the acceptance of LGBTQ culture between rural vs. urban, coastal vs. south, and pop culture vs. work culture.
There's also a major backlash against LGBTQ culture. E.g. I don't think that you can say that it is fully mainstream culture as long as we have the various Don't Say Gay laws and bans on gender affirming care.
This is highly dependent on context. In much of the world, it's dangerous to be openly sympathetic to LGBT causes, let alone openly LGBT. Even in much of the US, being openly gay is dangerous, and being openly trans is even more dangerous. A non-binary 16-year-old was murdered in Oklahoma this month; meanwhile, nobody's out here killing Swifties (at least, not yet).
That is an utter fabrication.
>Police in the Tulsa suburb have not released a cause of death but said this week that the teenager did not die as a result of injuries from the fight.