Thankfully, I see it ^^^ on a daily basis and literally just got off the phone with my next-door neighbor to ask his advice about a situation. He was 17 when he married his 15yo gf, and they’ve been together for more than 40 years now. He never graduation from HS and is one of the finest people I know.
My BIL and SIL found something to dislike about each of their kids’ prospective spouses. One truly was obnoxious, but even he was well within the bell curve of decent human beings and suitable life partners. And their kids were adults and making their own decision. I don’t understand why people fight this battle, especially when the relationship is unlikely to work out. Some good ol’ cc smile and nod is needed here.
ETA: There are multiple posts between @knowstuff 's post and my response so this may not make sense now, but whatevs.