I hear what you're saying, and some may question the tone...
...but it is perfectly acceptable for someone to question un-founded, un-sourced conflicting information which is being presented as fact by a poster. The forum rules regarding rumor, hearsay, etc. are pretty clear, and when someone continues to assert information, the sources of which are unknown, nebulous, nefarious, etc., it's perfectly fine to question such info.
I saw the exchange in question, and the questions themselves were perfectly legit. I think the poster's frustrated tone arose from the fact that the person being asked the question was simply avoiding answering the question, after being repeatedly asked.
At any rate, I still don't know if that poster ever answered the question. I pretty much tuned them out after they repeatedly ducked the question.