You’re right, Dave was born in '73, long past the Boomer cutoff point. Boomer is just another easy target to blame this mindset on but like you say this is something that defies generational gaps. I’ve met quite a few transphobic millennials/gen z-ers and from what I’ve seen on youngpeopleyoutube, really young kids are already being poisoned by transphobic social media subcultures.
That doesn’t go with the song at all