It's still an inappropriate use of the language and I find it offensive.
Well that's your right. You're allowed to be offended at anything you like. Doesn't mean anyone else has to do anything about it. It's quite appropriate as it's accurate and descriptive of the given behaviour. Personally I find the behaviour a lot more offensive than the word to describe it.
Quite frankly, if you're more offended by someone using the correct term to describe the behaviour than you are about someone choosing to behave in that way, I think you have your priorities all messed up.
The implication that a player's activity in game could be indicative of psychopathy IRL is horribly reductive. I'm sure there are players who's activity in game could be perceived to be indicative of a physical impairment, is that a fair reason to use words like "cripple" as a descriptor?
You really need to understand the difference between "you're acting like a psychopath in the game" and "you're a psychopath". If a player is ACTING like a cripple then it's fair to say so... though it wouldn't be fair to demand that they were a cripple in real life (at least not without them telling you that they are). Acting like a cripple isn't going to get in the way of someone else's fun though, unlike acting like a psychopath or a jerk.
As others have mentioned this is a RP game for goodness sake.
So if they're acting like a psychopath in the game would you prefer if I described them as "acting like one of my cognitively disabled clients" instead?
Do people here accuse D&D players RPing as Necromancers of being into grave robbing IRL?
Actually back in the day there was quite a bit of that (the accusations). Quite ridiculous of course.. role playing something in a game doesn't mean that you are or secretly want to be that thing. If however you saw someone role playing a sexual predator, would you still be so eager to say that it was ok, or would you find it somewhat disturbing? How about if a bunch of people were to role play police officers and imprisoned your character for breaking space laws.. would that still be ok coz it's "just role play?" Role play is fine, but NOT at the cost of someone else's fun.
I go back to my initial point (way back when). This is a GAME that we ALL want to enjoy. That includes noobz, they want to enjoy it too. Now sure he (the OP) was taking a risk to leave a noob alone in open and group would have been a better idea but the OP's mistake doesn't change the fact that the attacker was ganking. It's the same thing as a person walking down a dark alley getting mugged - sure they were stupid to take that risk, but that doesn't stop the mugging just being plain wrong or justify it in any way.
Sure, the player was probably ACTING like a psychopath and isn't a psychopath in real life, but that's basically a way of justifying acting like a jerk. "Oh I'm not being a jerk, I'm role playing a psychopath" "Oh yeah? Well how about you role play it somewhere else coz psychopaths are usually jerks who noone wants to be around and you're ROLEPLAYING a jerk really well".