My disagreement with you is that they were inconsiderate to you. You found yourself in a blind group, tried to backseat game them, and then wondered why they told you to stop and ignored your strategy. Obviously a blind group isn't going to want that and will ignore your strategy. There is nothing wrong with leaving a group on the understanding that you found yourself in the wrong group - I have no issue with this at all. But there is a world of difference between that and calling them inconsiderate and not willing to listen to advice.
I've been in that situation myself several times in a blind groups where the deal is that if you know the strat to keep stum unless asked, but someone just had to bang on about the strategy and couldn't let it go.
No, I read your post and disagreed with a few points you made, specifically that blind players are unprepared or inconsiderate. Seeing as I was far from the only person to pick up on it, and you felt the need to edit your post, it might be that you err'd in how you put your point across. The example I gave was pointing out that you can spin it both ways and from my experience the guided Ex groups have tended to be the most problematic. It might not be an experience you have shared, but its mine.
FTR, I don't consider players who enter groups and say "strat?" as blind players. But I also don't lump those players in with newbies who are asking for advice or opening the floor to you helping them. Thats pretty standard practice in MSQ content when people are new, and the game does not communicate the step up to extreme particularly well. In this case, judgement is kinda harsh because they aren't going to know how things work.