I have, but I attribute it to faction/server changes. I rolled a NE druid team on Emerald Dream, to be able to chat with some friends and PvP. By level 11, someone had explained to me how pathetic it was to have four accounts (I didn't remember to correct him that until I cancel my RAFs, I actually have nine accounts). I decided I didn't dig the Alliance thing so rolled a team of tauren druids on Altar of Storms, where my co-workers play. Alas, by level six I was informed at length that multiboxers were gay. I had no idea! My girlfriend is going to be displeased.

Lightbringer Horde still has a perfect record though. If anything is said, it's usually "wow" or "lol!"