Of course, instead of shoving the waiter around and swearing at him (which I don't think I'd call "taking a stand"), the OP could have approached El Establo's manager and told him what happened, given them the opportunity to make it right. While I can understand the impulse to be physical, especially when tanked up on wine and pissed off, it might just be part of why we Americans have such a lousy reputation here (and other places). Seems like a better reaction if you don't get satisfaction approaching it civilly.