Where precisely does the Rambam give mussar to his son about avoiding conflict? This article from Klal Perspectives quotes Kisvei HaRambam, Mussar l’bno Rav Avraham saying
Do not sully yourself with machlokes (strife) that destroys the body, the soul and property, leaving nothing. I have seen the bright blackened, leaders diminished, families broken, princes demoted from their positions, large cities weakened, groups disbanded, pious people lost, the trustworthy erased [and] honored people shamed and disgraced – all as a result of strife. Prophets prophesized, wise men shared their wisdom and philosophers explored and elaborated on the evils of strife, and they all could not truly capture the extent of it. Thus, I urge you to despise it and distance yourself from it and from all those who consider themselves its friends and supporters.
but where can I find that particular text?