I have no problems disagreeing with someone, but the phone chat has exactly one and only one purpose: Get the on-site. Then once I have the full spectrum of communication available to me (mostly worried about body language and facial expressions), I will gauge how open-minded they are and adjust. I've told people before that I think their $FAVORITELANG is bullshit, but I won't risk a job interview just to score an A+ on the "utmost honesty" scale. I'm happy with a preliminary B- while I'm temporarily unable get a solid grasp of what they're like.