On StackOverflow, lmgtfy.com is banned by a word filter, because it's insulting and because it's not in keeping with the goals of the site which is to be a encyclopedia of sorts of answers to common and uncommon questions. Someone decided to post an lmgtfy.com link as an answer to a question here on programmers.stackexchange.com. Should the same word filter be installed here too?
No, it shouldn't be banned. In fact it's a good hint that the question be closed.
If a question provokes a [working] LMGTFY answer then it is a poor question.
You say it's insulting to get that kind of response. But don't you think it might also be insulting to folks here to see you didn't bother to google first, then you didn't bother to put some effort into your question and then you will likely not bother to accept an answer?
BTW, did you bother to check if there are discussions already of this matter?
Maybe you can find your answer here.
Hmm... Doesn't seem to be banned. Strange. I'm looking into it.
No, LMGTFY links are not banned on Programmers-SE. Each site has a unique black list and it has not been added to Programmers-SE. The [feature-request] should be sufficient to raise the issue. Vote it up if you want it implemented or raise on meta.Stackoverflow, if you feel it should be a network-wide feature.
The technical aspect of the ban (blacklisting lmgtfy.com links in posts) might not be active, but it's my understanding the practice effectively is banned for all the reasons pointed out in the original Ban lmgtfy (let me google that for you) links question on Meta Stack Overflow.
There isn't a context in which they are helpful or constructive on a site where one of the main sections in the FAQ is Be Nice. If you see it being used, I suggest flagging it for moderator review.