GEN1448 Although the mitzvah of “Love your friend as yourself” Leviticus 19:18 obligated one to be tolerant of other people’s customs, and Mussar works extol the importance of overcoming one’s character faults, one should not voluntarily place himself in a difficult situation.  This applies to testing one’s tolerance of others in the same way as it applies to testing one’s resolve against performing idolatry or succumbing to other forms of temptation.  Futhermore, by living in the vicinity of people who act differently, one is in constant danger of transgressing the commandment, “Do not harbor hatred for your brother in your heart.” Leviticus 19:17.   … [One needs] to have foresight and avoid situations that will necessitate relying on one’s resolve and good intentions to overcome difficulties.   Indeed, one must distance himself from such situations at all costs.   The idea that separation from people who act according to a different code of behavior is commendable is implied in Rashi’s interpretation of [this verse].  “From the guilt of Joseph’s brothers we learn of their praiseworthy traits: They were incapable of speaking in one way and feeling opposite emotions in their hearts.”   … By minimizing close contact with people who have different customs and who act according to a different code of behavior, one may avoid strained relationships.   WAGS 59-60