1987 was my first season as a human being aware of MLB baseball. The Brewers were awesome and fun (and my dad's team/my team....despite living in Twins media territory), winning 91 games and generally being cool about it despite missing the playoffs.
The Twins won 85 games and won a World Series that year.
So... spite and jealously, mostly.
Once the Brewers switched leagues, I've slowly liked the Twins more and more, but not when they play each other.