Yeah, my point isn't that the people are right to hate Gen-3 Synths, just that its understandable and frankly inevitable, the Institute (and to a lesser extent the Railroad when 'their' Synths are discovered) have created a belief that anybody and everybody could be a Gen-3 Synth and those closest to you are the greatest threat.......people will turn on each other for a lot less.
So yeah if you want that belief to change then you have to do something that changes it, expect the Brotherhood or the vast majority of the population (including Railroad Synths who don't know that they aren't human) to suddenly decide to become pro-Synth to match your views is frankly more than a little daft, and would be terrible writing unless there is a reason shown for such a major swing in public opinion when the entire game is focused in the opposite direction.
I noticed the Brotherhood flags flying over Diamond City (before the Mayor is unmasked) and it seems to be a peaceful take over......just a scribe and knight on a trading run, Diamond City Security still running the place and I could take a step without being told what a good job I'd done and how glad they were that the Institute was gone.
I'd expected an unmasking of the Gen-3 in the population but nobody seems to care anymore except for Piper and the mayor.......was Piper supposed to kill the secretary, I thought she was non-hostile but Piper kills her ever time.