I think Biden might calm the trans issue.

Biden, his family, and their foundation have been big backers and major funders of the trans movement and gender ideology for years.

https://www.republicworld.com/world-news/us-news/sarah-mcbride-shares-story-about-joe-biden-late-son-beau-from-time-when-she-came-out.h

https://www.nytimes.com/2015/10/04/us/politics/pledging-to-fight-injustices-hillary-clinton-focuses-on-transgender-rights-in-speech.html

Biden and his foundation have put a great deal of effort into the campaign to lump together the LGB with the TQ-WTF? and to make all the other letters subordinate to the T and Q.

In 2018, Biden exploited popular interest in stopping bullying and being accepting to to launch a public service campaign that promoted trans lobby propaganda. The campaign was kicked off with a video claiming that "40% of trans and gender non-conforming adults" have attempted suicide - "most of them before age 25."

https://youtu.be/zFzjPorIkvs

The Biden Foundation created a video series celebrating the transing of kids and teens. Since Biden became the Dem POTUS nominee, the foundation has been shut down and much of the content on it has been scrubbed, but some of the videos celebrating of transing of children and teens can be seen on FB:

https://www.facebook.com/watch/?v=1287605571395045

https://www.facebook.com/watch/?v=329794174390346

When trump banned trans people from the military it became 'cool' and anti establishment to be trans

Trans was considered cool and anti-establishment many, many years before Trump announced the military exclusion in 2017. If you think transgenderism and queer theory are recent phenomena, you are mistaken.

Trump's election in 2016 was a response to a vast number of things that had long been going on in the US. One of the things, albeit not a major one, was the rise of transgenderism.

The Obama administration (of which Biden was a part) issued its infamous letter informing schools in the US that take federal funds that the adminstration had re-interpreted Title IX to mean that students must be allowed to participate in school sports and use facilities such as locker rooms, toilets, showers and dorms based on their "gender identify" rather than their biological sex in May of 2016. With this executive move, the Obama Biden admin put an end to female-only school athletics in the US, and took away the rights of female as well as male students to have any sex-segregated facilities like locker rooms and showers too.

At that point, Trump wasn't even the Republican nominee yet.

https://www2.ed.gov/about/offices/list/ocr/letters/colleague-201605-title-ix-transgender.pdf

The controversy over TIM MMA fighter and former Marine Fallon Fox being allowed to beat the crap out of women took place in early 2013. Back then, the mainstream press still allowed people like like Joe Rogan and Rhonda Rousey to voice criticism of Fox, but the media were already laying the grounds to paint anyone critical of Fox as old-fashioned, intolerant and "anti-LGBT." What's more, the mainstream media were also printing preposterous statements like this without questioning either the extraordinary claims ("no natural physical advantages") or the untruthful language (referring to Fox as female):

According to Drs. Marci Bowers, MD and Sherman Leis—two transgender health experts interviewed by Bloody Elbow's Stephanie Daniels—Fox should biologically have no natural physical advantages over her fellow female opponents due to her years of gender reassignment and horomone [sic] therapy.

https://bleacherreport.com/articles/1573044-ufc-joe-rogan-to-transgender-mma-fighter-fallon-fox-youre-a-man