We shouldn't have to debate the validity of posts. I don't think there are any rules in existence that say that all posts need to have a strict meaning and agenda. It's a slippery slope to start decreeing whether posts have enough worth.
If you don't like it, don't reply to it. Simple as that. We have moderators, it's their job to decide what's suitable for the board, no one else needs to instate themself as some kind of quality police.
It's not hurting you if a thread doesn't meet your standards. Why not start your own, rather than criticise other people's?