You don't know what you're talking about = direct insult?

Okay, thanks for the link. I could only base my original opinion on your description. I think it was fortunate that the other poster was gracious about it, but generally speaking, it’s best to avoid that type of blunt accusation, as you yourself admit in that thread:

That’s an overly literal interpretation of my point (see what I did there?).

I meant it as a guideline - a good habit to keep you focused on replying to the post instead of the poster. It’s practical in that it keeps you from getting mod notes and warnings, and it’s less likely to put the other poster on the defensive - which comes in handy when you’re trying to persuade someone to your point of view.

BTW, I’m not trying to be preachy here; it’s something I aspire to myself. I think practicing civil persuasive skills on the internet has real life benefits as well.