It's not difficult to deduce what kind of a response to the implication question is a socially acceptable one. I might also have no implication. Even if my implication was benign I wouldn't give you the answer. I don't want to reward coercion or biasing a conversation before it's even started. I don't know why people pretend to expect honest answers to such questioning.
If you expect everyone to be totally biased in the conversation then instead of picking the right soldiers for the battle I would suggest concluding that the topic is simply too political to discuss in a rational manner.
If you browbeat people for making observations on issues that might need fixing you're limiting your options for doing any fixing.
It's not difficult to deduce what kind of a response to the implication question is a socially acceptable one.
If you are saying that he can figure out whether lying or telling the truth about his implication is socially acceptable, sure.
The real problem is that he already had an implication, but he's using the fact that it's an implication to maintain plausible deniability by not coming out and saying it. Saying it may be socially unacceptable, but that's because making the implication is also socially unacceptable.
Here is the 2013 edition of the Best of Rationality Quotes collection. (Here is last year's.)
Best of Rationality Quotes 2013 (400kB page, 350 quotes)
and Best of Rationality Quotes 2009-2013 (1600kB page, 1490 quotes)
The page was built by a short script (source code here) from all the LW Rationality Quotes threads so far. (We had such a thread each month since April 2009.) The script collects all comments with karma score 10 or more, and sorts them by score. Replies are not collected, only top-level comments.
As is now usual, I provide various statistics and top-lists based on the data. (Source code for these is also at the above link, see the README.) I added these as comments to the post: