Had one guy suggest that we ex RAF types were on a 'second career' so we should just 'watch it'. I didn't mention that I was on a third of fourth career or he'd have had a total spin-out.
I found most non-mil trained pilots excellent, well adjusted, good handlers and nice to their FO.
As a B747 captain I had some ex FJ FOs on the Jumbo as their first transport type and it was clear why they made FJ and I didn't - they converted easily, were well adjusted, no 'chip' and the only comment, when I asked, was "It's got a lot of inertia, hasn't it?
As previously mentioned, some people, mil or civ trained, are great and a very few less so.
CRM peer reporting came as a great shock to some whose view of themselves was very different from that of their colleagues.