To ask whether anyone else has noticed this phenomenon?

[proximalhumerous]

Whereby someone posts an AIBU thread and another poster comes along with a tenuously-linked scenario in which they are clearly not being in any way unreasonable and proceeds to get very offended, indignant and self-righteous.

For example:

OP: AIBU to think you shouldn't buy a pet if you are not able to look after it?

Outraged Poster: Well we bought a dog to have as a family pet and we loved it very much, but then my husband had a freak accident at work and all his fingers and toes fell off, and my DS developed a life-threatening allergy to dogs and then my MIL, my best friend, my next-door neighbour and my beautician passed away, and I was diagnosed with acute housemaid's knee in both knees so I couldn't walk more than half a dozen paces, but if you want to judge us for not coping and for asking my sister to look after DDog for two weeks while I recovered then you go right ahead!

Or something to that effect...

The ones that really get my goat are the ones that go,

”AIBU to go no contact with my mother after she shagged my husband, burned my house down, stole my car and rang Social Services because I refused to let her put gin in my DC’s bottle?”

”YABU. You’re lucky to even have a mother. Mine died when I was 53.”

Oh yes! I had to quit that one 🙄

Exactly.

OP: It really isn't necessary to explain things to your child at the top of your voice so the whole world can hear you.

Outraged Poster: Well my child is profoundly deaf, so what am I meant to do? Whisper?

Obviously the OP wasn't including people whose children have hearing loss and obviously what they said doesn't apply in this case.