There's nothing to say about a happy family. Tolstoy got it in one ("All happy families are alike; every unhappy family is unhappy in its own way”).
I very much like the light-handed way this place is modded. The line should be drawn at person insults of players, the club, the owners, the manager, and other posters. (Mods are fair game…)
One other point. I don't know who these posters are who only emerge when things are going badly. I genuinely don't. I'll take your and the other mods' word for it, since I don't have my finger on the pulse. There's a bloke sits behind me, he's only happy when he's effing and blinding about how shit this or that player is. When we actually score, he never says a thing. I think he may actually be disgruntled. I'm sad for him, and the kind of inner life he must have.
But when people object to people on a post-match thread along the lines of “You spoilt fucker, don't you realise that we've won six titles in ten years, didn't you see us win a treble in 2019? weren't you at Edgeley Park to see us beaten by Stockport bleeding County? etc. etc.,” all of that is strictly irrelevant. A post-match thread discusses the issue in hand, for better or worse, i.e. the match that's just been witnessed.