Not all the time, sometimes they're very relevant to a thread and add a new perspective to a subject.
But sometimes on a thread where someone is wondering about say, someone having their music switched up too high on the train so it's seeping through the headphones and you have a poster who comes on and says:
"Well that could have been me this morning OP because I'm recovering from the flu, have a ds who wakes up at 3am every morning, a Manager who hates me and a landlord who hasn't fixed the washing machine despite SIX phone calls in the last two weeks. So sorry if me trying to listen to some music and accidentally turning it up too high offends you, but actually I have more important things on my mind."
AIBU to just find these tirades a bit irritating?