Wearing the mask is essentially the mark you get put on you for using MK.
It's not that it bothers me, it just pains me to see people who go to MK when they aren't confident elsewhere. It's completely fine to play to win, but it's not what entertains me. Not that it matters to me at all because I'm not really watching or following Brawl at all anymore, but still.
I had just won one game with a lucky trip (he tripped into a smash) and otherwise lost like 5 in a row (one via trip but whatever). And people were like "No one here plays MK" so I said "Ok I'll try it!". Then it turns out his Wario didn't know the MK MU at all XD. And then Snake came along and I messed up a few times (new character in tournament does that...) and game set.
But I've never fought a Wario before and until I switched to MK it was literally the most frustrating thing I've ever done in Brawl, tied with the first time I ever fought RRR [very skilled Kirby main] - it was like fighting Fox in Melee as Link [it feels like you can only shield, and that gets worn away...], but in Brawl where I don't have nearly the pressure options or tools to punish his air camping. Falco was a LITTLE better but we were CGing each other back and forth and the Waft was the difference.
Then I switched and was like "wait... I outrange your everything. And I can surround myself for short-term protection in pressure (nair!)." And so I won .
I'm going to go to the Q&A thread and ask for help in that MU (probably Falco and Pikachu threads, not just Pikachu). And also ask about dealing with DK's bair and dsmash (those things are so annoying...).
I probably was the lesser-skilled player in some aspects, but I have to ask: if he can't play X character and I can play X character to beat his other characters, am I lesser-skilled because I use a better character, even if he lacks the skill to use that character? [By everyone's admission I was the best (only) even partial-MK there, which all of us were unaware of until partway through Loser's Finals game 3 when I pulled out to a fairly strong lead.]
I'm also aware I should be clear on the situation - for the record I thought I was on my way out with an 0-3 so I switched for kicks, not because I credibly thought I could win a game with MK [and because no one else had played him the entire tournament, and he was not played in Grand Finals either].
Also red, I use him because, alongside Pikachu and Falco, he's fun to play (as are Luigi and Samus, but I suck with them more so they stay in friendlies), and winning is usually a great deal of fun for me [of course]. So while I do play my characters to win (if I didn't care I'd probably just play Samus or Luigi), I usually try to make my character selects so that I'll win but also have fun - I figured getting air-camped to heck was unfun so I'd give chase - it just happened to be significantly more effective than I realized.