It’s all about power with O’Reilly. He want to come across as the know it all. I really don’t understand why he has to explain anything. It makes Trump look petty. If he’s going to be interviewed make it quick, but why let O’Reilly make you look bad.
OTOH...If O’Reilly agrees with him, then by all means do the interview.
Yes, Pied Piper Trump should only do interviews with people who agree with him, but only if they kiss each other on the lips first.