I have had very few negative encounters with ANYONE in WoW so far. (Guildies insensitive comment aside.) I can think of precisely two. One time an Alliance character repeatedly killed things my bro and sis-in-law and I needed to hunt (at level ~15) for quests before we could reach them. The other kept jumping in front of my bobber while I was fishing in Booty Bay. Both were WAY higher level than I was at the time, so goading me into a fight seems rather pointless. (on the other hand, that last incident taught me the wonder that is /rude. Damn, that's just funny. Made me feel better, too. The Ally ROFLed for it, even.)
Thing is, both times the characters in question were... Palladins. Yes, the one's that are supposed to be paragons of goodness. Taunting noobs. All I can do is shake my head.