I guess that depends on whether you’re someone who actually thought the beginning of this century was the year 2000. Those are all the folks who thought the counting of years started with year zero rather than year 1.
Maybe when they learned to count, it was zero through nine. I was taught one through ten. Maybe this was part of the “new math” craze of several decades past.
I’m sure many people think this is a trivial thing, but I happen to be fueled by logic most of the time, so that must be why this drives me nuts. According to WikiAnswers, the next decade doesn’t really start until 2011.