I dare say it’s a ‘people’ thing, rather than a ‘church’ thing. FWIW a SiL of mine, who had a very senior volunteer role with a local animal charity, eventually had to leave, because of the amount of bitching and backstabbing among the volunteers.
A Dbro had something very similar - again a voluntary role into which he’d put a huge amount of time, after he retired.
An aunt of mine is a very ‘churchy’ type but to me is a totally un-Christian woman - extremely judgemental and openly - loudly - critical of other people. One of the many reasons I avoid her as far as possible is because she told me that it was my mother’s own fault that she got dementia. ‘If she’d been more like the sprightly 91 year olds at my church…’. All in that brisk, I know best about everything, tone.
OTOH the cleaning lady my mother had for many years, including after she developed dementia, was also a devout churchgoer and was a genuinely good, extremely kind-hearted person. TBH I don’t know what on earth we’d have done without her.
Good and bad, nice and not-nice everywhere, I’m afraid.