Why do you you think we love a good moan/complain?
Does it make for good conversation?
Bond people due to bad experience?
We love to find a fault rather than positives?
There are many examples I could use .... But here's one
If you went to a luxury hotel that was that the bees knees had everything you could want but you realise that they forgot to leave your complementary toiletries. You would forget how clean the room is ect ...march right down to reception and complain.
Is it just english/British thing? Not sure
I'm not that extreme it was just an example but some people no matter how positive a situation is they will always find a negative.
My mother in law had her bathroom done... It looked amazing tbh but when her husband finally saw the end result after the builder had finished, he didn't say how nice it was , he noticed a small crack in one of the tiles
She called it moaning. He called it an eye for detail.