I met them at a job fair personally. They had multiple job opportunities regarding railway vehicle operation, engineering topics, etc. I introduced myself, detailing that I have B.Sc. in Mechanical Engineering, M.Sc. in Electromechanics, machine design + manufacturing + operation experience, as well as many years experience in industrial software development for onboard railway computers (including real-time, safety-critical systems). Of course, I named the companies that had employed me for those duties. They response was: 'first of all, have you got a high-school diploma?'. They did not mean the paper, but the fact whether I have managed (succeded) to graduate from any high schools... (For the Hungarian readers: we carried out our conversation in Hungarian, of course. Originally, I had written this review with Hungarian terms, but Glassdoor blocked it because of the non-English expression.) I do not think that the recruiter person was so dummy that they did not know that B.Sc. and M.Sc. certificates required high-school diploma as a pre-condition. So the only likely reason for their questions was that they assumed that I was lying or that I was dumb, so they were challenging me. It was only me who was being challenged this way at that place that time. Considering the fact that my attitude, look and expressions were polite and professional, I have to assume that they unfriendly behaviour was motivated by some unprofessional behaviour factor of the recruiter personal.