I have a serious question about the Flat-Earth theory.

Flat-Earthers get into arguments with people who think that we live on the outside of a globe.

People who think that Earth really is inverted and that we live on the inside of a hollow sphere, they also get into arguments with people who think that we live on the outside of a globe.



My question is:
Do Flat-Earthers and Hollow-Earthers argue with each other about who's right?
Do they exchange measurements and theories and accuse each other of being shills for whatever conspiracy?
Do they set aside their differences for their fight against the real enemy: mainstream-science?



From what I have read about their mindset, it seems like they wouldn't criticize each other despite having every reason to do so.
From what I have read it's a taboo to criticize another person's conspiracy-theory.
Why?
Because, if you criticize their's, then they might criticize your's.
And even worse: They might cast you out.