Do I have to support my League?

So this is hilarious that Rudy[eez-nutz] Giuliani[eez-nutz] is now claiming to be a Red Sox fan. I like also that the Republican fascists at his hate rally applauded him for it. Or, more likely, they applauded the (again, hilarious) spectacle of a Yankee[z-nutz] fan shaming himself. Beautiful.

But in the TalkLeft thread there is this idea I have never heard about before, that when your team fails to make or gets eliminated from the playoffs, you're then supposed to support whoever wins your league, the exception being crossing the lines of the Yankees–Red Sox rivalry.

But I don't want to root for the National League, because a) I don't really care about the Rockies, b) I have lots of friends from Boston, c) I also like the Mariners, so I can choose which league I root for in the Series, and d) a Red Sox win would piss off Yankees fans and force them to throw away their "1918 - 2004 - 2090" t-shirts, which event must be considered a universal Good.

So, go Red Socks.