What is the ruling on dealing with a roommate who does not pray and describes those who pray and commit mistakes as "hypocrites"?

Accusing a worshipper of hypocrisy for committing errors stems from ignorance, for everyone errs, and the best of those who err are those who repent. The five daily prayers expiate sins, and the worshipper is closer to forgiveness. Your neighbor must repent and pray; if he insists on abandoning prayer, then seek a righteous neighbor.