Pally/PLD
Toon/Character/Avatar
DD/DPS
Sword and Board
Threat/Enmity

I have seen them all used and I use them all interchangeably. None of them bother me and it doesn't bother me to use them. We come from all walks of life and come from various different gaming backgrounds. For example I first started my career in UO(Ultima Online if anyone needs to know) WoW, SWTOR, TERA Online, Rift, DCUO, DDO, LoL. I have played numerous MMO's and MOBA's each for varying degrees of time both free to play, pay to play, and pay to win. So in the end be excellent to yourselves, and each other no matter the terms they use or the terms you decide personally you want to use.