YABU / yanbu; I can see both actually. Agree with pps that OPs ask for opinions and they shouldn't be surprised when they get a wide range of viewpoints. They don't have to like them or follow advice.
That said there are some pretty pathetic keyboard warrior types on here and it can be hard to brush them off when you're feeling vulnerable.
I had a thread about a year ago which stuck with me. It went a little something like this:
Me: AIBU (I was a smidgen)
Most posters: YABU - here's what you should do
Some posters: yanbu
A couple of posters: YABU and you should be ashamed of yourself
Me: well yes maybe I abu. It might be to do with the death of someone very close to me. I mentioned them in my OP as they were effected by the same person I'm asking for help with.
One poster: why are you bringing up other issues now? Just cos you don't like what people are saying?
Yes, I'm thrilled this person whom I loved very much and who was close to me my entire life died far too young. Yep, thrilled. Because now I can 'win' at MN. They were a human being, not an "other issue". People forget that OPs are (usually) real people posting about real issues. It's not a game.
I've seen something similar again on a more recent thread where someone mentioned a very sad bereavement. Cue several people saying it isn't relevant to the thread. Oh I'm sure the poster is so sorry to break the 'rules' of MN. That's what's really important
.
In brief, some people can be so quick to prove how righteous they are they don't have time to listen or empathise.