Link to the PBS article
Link to the PRRI report
The most interesting part here is that the change is been driven largely by young republicans. They went from being two thirds (65%) in favor of gay marriage to just under half (49%) and also underwent similar changes in their support for anti-discrimination laws.
I honestly think that the LGB portion of the acronym is suffering from collateral damage by association. It is the 'TQ+' which is almost certainly driving this decline.
I think self-radicalisation by young Republicans who refuse to touch grass is driving the decline in support amongst young Republicans.
Honestly this is the theme I tend to notice with younger people who are radicals far-left or far-right - they tend to be terminally online "loosers" who don't even want to make much of effort to put themselves in the real world.
Might sound hypocritical from me, a guy who has like 14k posts on this forum, but at least I try to put myself out there in the real world and am not just scrolling through TikTok and Instagram reels for 10 hours a day.