What I try to do is make an effort to adopt all the disliked beliefs as temporarily true (it's pretty hard) and do my best to understand why the person believes that and what the good points, if anything, are. It helps if you can imagine that the disliked thing was actually written by someone you trust, so you can think: "Hm, well, it might be wrong, but maybe I'm the one who's wrong! And in any case, I should try to understand."