Ok, eariler I was looking for a section from Caitanya Caritamrta about devotees fighting with each other and it had mysteriously disappeared. Recently I found it! But not in Caitanya Caritamrta, it was in the Nityananda Caritamrta- close but no burfi, hehe.

Its at the very end of Adi-lila:

Vaisnavas are always pure and full of knowledge. So, if there is ever any quarrel between them, know it simply to be part of their pastime. If a person takes the side of one Vaisnava and criticises another, then certainly he is vanquished.

for some reason I thought there was more to it than this. But anyway, good passage to keep in mind when you see devotees fighting.