I dont have issues with people who make mistakes while trying which is human nature. We have all done it. Its those who flat out make up FALSE info to suit their needs. Those who will embellish History. People who refuse to leave blanks on the tree and make anything up to trace their family even though no court record exists. And then there are those who refuse to accept the truth of court records because it dis-proves their claims. And then there is DNA. Some people will not accept the DNA results over paper. I had a few freak out that many of my lines are out of wedlock, DNA does not match surname and some who fully accept that DNA is accurate and paper wrong. You get all kinds of people who research and its hard to change people.
I just try to find the people who are willing to "Try" and get things accurate. If we make mistakes along the way, it happens. I just refuse to research with people who will flat out make things up