I also met a ton of other MD's in my pre-medical career; attendings, residents, and students alike. Almost uniformly they told me to reconsider medicine, that I'd end up hating it and that it would be a mistake to attend. They said they wouldn't go if they could do things over. They told me I'd make better money in other careers etc. (As if I was motivated by money). It was a turnoff honestly.
I only met a handful of DO's as they are few and far between in my home area. But what struck me was that they all told me that they loved medicine, loved their jobs, and that they loved medical school and would do it again in a heart beat if they had a do-over in life. They seemed so positive about everything, and really encouraged me to go into medicine. They didn't push me to DO school, but they did give me the impression that there might be something about becoming a DO that would make me happier in the end. I mean if there's all this stigma, and DO's are apparently "second class" doctors; then why were these guys so happy while all the MD's seemed so miserable.