Um, just because it's not in the rules doesn't mean that you start one. We don't do it because we have a little common sense. Hence, most likely, Deezer doesn't put it in the rules.
Yes, a flame war is when people yell at each other back and forth and it is very water tight (like the little Sadib and Santa [sorta] incident).
"I do one sit-up a day. I get up in the morning; that''s half. I lay down at night; that''s the other half. I figured out a long time ago that my body was just for carrying my head from place to place." ~Mark Lowry