This fallacy occurs when someone refers to an expert in the field, and because THEY say something then they are definitely correct – and so this is the end of reasoning or questioning. So perhaps there is some dating expert and they give certain advice and if you don’t follow it, then this is the reason you are single.
It doesn’t need to be a person, it can be misapplied, expert knowledge. For example, you can go through various scientific evidence and use it illogically. Say there was some study that finds a genetic link between being involuntary celibate for extended periods and genetic factors, then that could be accepted fatalistically, as “that’s just the way it is then”, and so the end of reasoning or questioning. But life is never genetics alone and is always very complex.
Another piece of research I came across was from a UK newspaper, where around seventy percent of people said that they wouldn’t date a disabled person. Now that might cause despondency if you are disabled, but logically thinking it’s not possible to make blanket statements or predictions about this. Firstly, it could be culture specific, you can still find someone in the thirty percent, what people say and do are different things, what disability were they thinking about. There are so many flaws in this argument. If it’s accepted without reasoning, it is the end of the argument, an illogical and untrue end that will create an unnecessary future.