I don't taunt in for glory matches unless they do it first and I'm feeling like mocking them after a kill, or to greet a recurring player. A lot of characters have better things to do in that time anyway, like charging shots or turnip farming. I also used to SD if my opponent offed themself in a silly way, but the favour is rarely returned, so I just take it as a free kill. I'll back off if someone taunts at the start of the match as well, but if they taunt during a match, it's fair game to assault them.
Smash etiquette: serious business. Yeah, I'm not really fussed about what my opponent does at all though.
Smash etiquette: serious business. Yeah, I'm not really fussed about what my opponent does at all though.