In my experience, certain personality types are drawn to this occupation. It takes certain personal attributes to do what we do; self-motivation and the ability to work on your own is one of them. Most appraisers I've ever met were drawn to the opportunity to work solo most of the time, even when working as an employee. TBH, i believe most appraisers work alone precisely because they're not good at working others.
Appraisers are also notorious as a group for being contrarians and for being willing to disagree with anyone, up to and including our own clients and peers. As a group, we have no respect for any job title or employment status or any other "authoritative voices". If someone is telling you something it has to make sense to you before you're accept it. "Trust me because I'm an expert" doesn't cut it. These are necessary attributes for what we do; being unable/unwilling to say no when necessary would be a detriment to our role.
If we were better at working in groups and if we cared more about the opinions of others then most of us wouldn't even be in this line of work.