My experience is five years worth of interviewing hundreds of applicants for residency and fellowship positions. After the interviews are over, the committee does go into a little room and debates about all of the applicants. When the chief states that he would rather have a foreign MD than a DO, then that quite a statement. And when that statement is amplified by the program director, it carries alot of weight.
Believe what you want, but behind closed doors, this is the kind of discussion that goes on. And I am certain that these discussions are not unique to our institution.
To carry matters further, several applicants over the years have asked about whether FMGs or DOs are/were in the program in order to measure the strength of a progam.
I did not state that a DO or FMG is inferior. I am stating facts from my personal experiences regarding resident selection. If you have been involved in resident selection then feel free to provide input. Whether this bias is justified or not, I have observed it in the resident selection process.