A few thoughts on this entire thread.
Sportsmanship and whatnot has always seemed like an issue in the Smash community to me. My very first tournament (aside from obvious bad TO issues) I left after my loss because my opponent openly mocked me mid-match and refused any sort of hollow sportsman statement or handshake. Call me a salty newcomer, but it turned me off the competitive scene for a very long time.
As for defensive strategies. That's how I tend, myself, and quite honestly, I still find it pretty boring to watch. I was cheering for Larry all three rounds despite him playing Sheik, but I was still pretty pleased that Awesum took a game off a character I consider borderline broken. I was also convinced Larry shouldn't have struggled had he used his specials better or swapped characters, but still. Even with a bias against pure camping (which is deep seated in my past despite my own shift towards defense to make up for my terrible aggro reflexes), I found the set enjoyable (moreso than Sanic vs Mario).
Awesum and Hungrybox were the only two matches I noted boos for. Wouldn't have surprised me if it had happened in Manny vs Ally, either, but I had lost interest in the stream due to that one. Booing isn't sportsmanlike, respectful, or even humanly decent. And, especially in a fighting game, it's really hard to differentiate between "booing the player and booing the play/character/strategy." Personally, I don't think there is one. But it's not just Smash or the competitive scene that has a general hatred of defensive play. My first time running 1322 Villager, I had suitemates who have negligible interest in Smash complaining that there was no way I could possibly be enjoying playing that way.
It's an issue, and it's pushed a few of my friends out of the Smash community, and has pushed me really close to leaving it, too. There's a lot of hypocrisy where players (regardless of actual skill or reputation) promote playing to win and playing with every tool you have (infinites, camping, top-tier-levels of power, being ZeRo), and with their ruleset-making hand still reflect a conflict of interest (if infinites and timeouts are both legal, stalling with an infinite has no logical reason to be banned). It's frustrating to see, and I have a hard time even wanting to convince my friends to stick around or become more active in the community when it's this bad.
Of course, I'm also so passive (personality-wise) and jaded (and through such, indirectly responsible) that I've given up on trying to fix the problem actively. I'd love to be proven wrong, but at this point I believe the only way for the problem to be fixed in anything approaching a reasonable timeframe is for an authority figure (TO, major sponsor, whoever) to come in and heavy-handedly deal with the issue, without discrimination. If that means the top player in a scene has to be banned from a tournament for months or life to get the point across, so be it. I think nothing less will solve the issue.