I have personal experiences with this subject and your neighbor is correct. I have two people very close to me, one just lives his life like we all do, work, hobbies, time with family and friends...he was even employed in a former life by Pride in NYC and I suspect he finally left that job to escape the endless need to only care about "the cause". He's one of my dearest friends and one of the funniest people I know...smart, witty, and never ever ever shoving down anyone's throat a single thing about being gay. He's a happy and contributing member to society.
The other feels the need to only care about the LGBTQ community, every cause, every complaint, every blog and post she makes is only about what she cares about that's near and dear to her. She's so wrapped up in it, she can't speak eloquently on anything anymore. There are no civil conversations because the world is out to get her and her "tribe". She's lost the ability to see anything through a clear lens, and feels it's her job to tell everyone else how they should feel, how they've wronged her, how they should vote, you name it...always boils back down to her only caring about a small segment of the population, not humanity in general. She's queen of "the talking points" and if you press beyond those, you just get her rage. She's generally a miserable human...
The differences I see between these two people are pretty astounding...I've attributed it to exactly what your neighbor said.