I see what your saying, but when you see one clearly is making things up and stating them as facts, or asking a quetion from a false premise, telling him to look it up makes perfect sense because he got the facts wrong!
I don’t see legitimate questions over here, I see a statement (or question as you call it,) that accuses a big group of Yidden being oved avodah zarah. This statement can only be “asked” out of a lack of knowledge of the subject at hand. The only way this “question” can be “asked” is if the questioner doesn’t know what a Rebbe or Nosi Hador means and he doesn’t know what purpose they serve. So it makes sense to tell the questioner to look up what a Rebbe/Nosi is, because that will answer the question, (by showing that that question doesn’t exist!) It does work that way in “real life.”
Telling someone, who made a statement with nothing backing it, and says that learning a part of torah {RaMbaM} is wrong because the people that learn it only do it on a very “low” level, should be told to check the facts. This is because this statement is wrong! The fact is that many people learn this RaMbaM cycle b’iyun! There are shiurim released everyday! (As said above.) So by telling people to “look inside” and check their facts does solve the problem in “real life”, because the question on the cycle doesn’t begin to exist!
(To add, even if p/p didn’t learn it b’iyun, (which for the most part is not true,) there is also a derech of limud called learning things b’girsa! Learning torah should not be discouraged even if it’s not being learned B’iyun! I’ts Am Haratzus to say that!)
This (false) Lashon Hara stated about a large group of Yidden is scary and disheartening! (The aveira is ma’avir many more times when said about a large group.)