I've seen plenty of instances where people don't want fights explained. I don't like it when it happens on release either, but I don't actively fight it. I don't feel this person handled it well (and I feel you were a bit hostile too), but I understand the sentiment of wanting to go into it blind.

And sure, you can set up a PF for a blind run, but those aren't usually the kinds of things PFs are built for (not for normal content at least). And you could easily get someone in there who wants to spoil it just for the lulz, so really, I get why it can be frustrating to someone who wants that fresh experience and doesn't have a easy way of getting it.

This is why I end up depriving myself of sleep to do the stuff I really wanna do blind at the crack of dawn on patch days. It's the only real way to be sure.