There's SO MUCH room for all kinds of misunderstanding on here. I can't say I've run into "condescending" (or even seen it) - but then, I don't ask many questions. I just come looking for one or two here or there if I have nothing better to do. Maybe I haven't noticed some things because I pretty scan past anything political.
One thing is that it's always, or at least often, tricky to convey the right tone in typing; so there's always risk of someone misinterpreting a "straight, sincere" answer from one that's either a plain, old, insult or else a condescending one. People often don't know who already knows what, so that factors into the mix too.
The other thing, though, is that someone (like me) who scans through the questions often enough can notice how many questions pretty much don't look either like they're aimed at sincere discussion or else giving someone ideas for a Hub. They just look like someone's either whipping up all kinds of questions (for whatever reasons they are, or else they're asking questions for possibly questionable reasons. So sometimes an innocent and sincere question may seem (to one person or another) like "yet another questionable question" - so they give a fresh answer.
Not to turn this into "blaming the victim" here, but so often, too, people take things as an insult and/or as someone being condescending when, really, it's just a matter of whether someone speaks/writes without a lot of fluff, or whether someone fluffs and "nicey-nice's" things. Some people are OK with "non-fluffed" communication. Some are OK with it from SOME other people or about some subjects. Some people expect "fluffified" from everyone (or just some people about some subjects).
Some people see "non-fluffified" and seemingly more "blunt" as "rude".
On the other hand, the person who leans toward "fluffified" and "nicey-niced" in order not to seem too blunt can come across as condescending. It doesn't help that some people "on the answering end" (whether here or offline) think if they "fluffify"/"nicey-nice" an out and out cutting remark (that's intended to be that) and get away with being demeaning and cutting by "taking the edge of it". Then again, there are people who are just nice and don't mean anything by a remark that may be taken by the wrong person as an insult.
I think all anyone can/should do is either ignore it all, or maybe ask someone sincerely if meant to be insulting. After that both parties can either drop it or move on.