Is it really helpful or productive to openly call a question a lie?

There are times I’ve witnessed a question regarded openly with hostile accusations it is a lie.

Even if the problem is a legitimate one that many people might face, such as cancer, cheating spouses, finding birth records, bullying at school, sexual dysfunction… I have seen some questions elicit a slew of comments that basically say “bullshit, we don’t believe you. This can’t be real.” I’ve seen it a lot. I wonder what exactly the point is.

If the questioner is telling the truth, then the cynical person is being unkind and unhelpful. If the questioner is lying, someone “out there” just might have cancer or sexual dysfunction or a bully they are dealing with, that might get helped by the post. In my opinion offering an an honest real answer would be more helpful.

However some people may think they are protecting other jellies from becoming emotionally sucked into a lie and wasting their time, or upholding standards of credibility on this site.

So I ask you, is it productive to call questioners liars, even if they may possibly be? Does it create a hostile atmosphere? Does it conflict or go along with the culture of this particular community. What are your thoughts? When is this appropriate? Should people do it? It is your community, so I’d like your thoughts.