I honestly don't get why beating someone mercilessly in the game -- a game about mercilessly beating the crap out of your opponent -- is all of a sudden 'without ethics or etiquette'.
I would like to think of myself as a nice guy, but if you keep spamming moves at disadvantage, I really don't care if I win by BB-ing you all day. I also would want another player to do that to me if I keep doing punishable moves. That's the only way I would know if something is wrong.
However, I'll gladly tell you why you lost. I think most competent players, with the exception of the handful of real pricks, will tell you exactly what you lost to or why you lost. I think this is the true way of growing the community at large -- helping newcomers get into the game and understand why they lose to bring them up to speed as fast as possible.
2 cents.