Yes you are correct and I think that I know the particular theead that you were referring to. I do make the odd boo-boo (don't we all) and I am quite happy to be corrected when I do. On that particular occasion I was not wrong - I know this because I had sought advice in private correspondence with another member (expert) about the problem in question (not the specific thread). My only regret was in responding to the "rubbishing" when I should have just ignored it and added the postee to my blacklist (which currently stands at about three after 3 years on the forum).
I also have (well, had) concerns about relative newcomers' contributions being rubbished and I posted a thread about this in the Helproom. Basically, if you think that someone (and that includes me) posts incorrect or misleading information then, of course, say so. But politely, and with the correct solution. (In the case of my postings, politeness is optional.)
Whilst I have the floor (as end would say) I also find it extremely frustrating when somebody posts a problem, several different solutions are offered, and the thread is green-ticked with no feedback. But maybe that subject is for another thread?