At a museum/house I work at, we often get members of the public telling us something is "wrong" or trying to correct us on something. Yes of course I understand sometimes even experts make mistakes on the history or would it still be an academic subject.
I'm talking about more simple stuff such as did they have harps in 1850 etc
All information learnt by front of house has been carefully prepared by highly educated researchers/historians/academics etc and been heavily reviewed. But we always seem to get people complaining about things being inaccurate.
More often or not they will be American or have "delusions of grandeur" about themselves.
Working for us we have a leading architectural historian with cantab phd etc She is pretty much the expert. An American decided to argue that something wouldn't have existed in X year as she knows this from being part of a mediaeval re-enactment group. She got really quite arsey when very politely informed that she was mistaken.
AIBU to wonder wtf a very select number of visitors think they are?