I'd say it's mildly annoying, but I take a different tack. 1st, it's only mildly annoying. I strongly doubt anyone is dumb enough to think that Case will actually get their question answered faster.
I think that from a technical career, I've become mostly indifferent to case, and actually have gotten to where I lean more towards using one case exclusively when coding (it's been not-gently suggested to me by expert SQL guys to do the same, although I do not currently follow it at my job, but only because Redgate changes it).
Thus, to me, someone who puts a title exclusively in all large caps is no 'worse' than people who refuse to capitalize--putting everything in smaller case. In this scenario, I could say they are being just as sloppy as the all-caps guy is being obnoxious.
Plus, as Jon implied just now, how would the 'Solution' decide whether a limited use of all caps, such as a title reading, "How to use WHEN EXISTS in SQL SERVER" was appropriate, or not?
I think it comes more down to style and bias than initially seems like.