You're equating Good with Lawful there. This may be fine for your games, and your personal out-of-game convictions, but it's not what the rules say.I think this is the biggest misinterpretation with "neutral": Players believe that they can commit any evil/chaotic act so long as they balance it out with something good/lawful. Not true. Neutral simply means that you don't perform overtly good/lawful acts (such as stopping a crime or saving a kitten in a tree) as well as performing evil/unlawful acts (such as dumping your radioactive waste into the local pool or stealing from an old lady). IMHO your barbarian performed an unlawful act by purposefully stealing from you, breaking his "neutral" status.
Theft is (generally) an evil act, IMO, and certainly evil when you're stealing (out of selfishness) something from a teammate or good-aligned individual.
That's not to say that a rogue picking locks for the party is evil, nor is he evil for lifting the key (and purse) of the dreadful prison warden in the adventure, nor is he really evil for stealing from evil NPCs, nor is he evil for stealing a dangerous artifact or item from a good NPC, etc. But stealing from a teammate to satiate one's own avariciousness and ego is an expletive Eric's grandma wouldn't like, and it's evil.
Sorry, even good aligned can do that stuff. Good does not mean = not a jerk.I would like to ask if the following set of actions constitute a chaotic evil act or a chaotic neutral act. They were perpetuated by a chaotic neutral elven barbarian with a rather unsavory player who is in the same D&D club I am in.
1. Jump into game after the ending boss is defeated, without having seen him.
2. Steal, by sleight of hand, the "key" to the final chest from a fellow player.
3. Take pick of best loot.
The player the "key" was stolen from was me and before I could do anything the loot had been distributed. The DM threatened me with a Chaotic Evil Alignmnet if i attacked the barbarian but he is green behind the ears so I was hoping to ask if anyone here could give input. If there is a consensus that he was in the right as a chaotic neutral character I will drop the issue. Otherwise I will bring complaint to the club officers concerning this.
Thank you for your time.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.