We don't want flaming because it is useless, disruptive, makes showcases bloat, makes users that want to look at showcases have to see through stupid sh**, not constructive, promotes unrest through the community... I can go on forever.
You're not getting an exception either, especially considering that flame wars seem to follow you wherever you go on those boards. No one is getting exceptions to the rule.
So no, as AS said, no flaming in showcases, not up for debate.