He was a beginner, it was up to more experienced players and GM to clarify the nature of the game. Some games are supposed to be ruthless - tell a person they need to role-play an evil character, and what do you expect?
"Stop, apologize, until you understand what you did was wrong."<p>The OPs coworkers are pulling the most obvious high school mean girls routine, and OP must grovel to be let back in? F that. It's just a game, and instead of giving the new person some leeway they close ranks. That work environment sounds terrible, petty and uncooperative.<p>How about _they_ stop and apologize for being immature children.
Every D&D group I've played in heavily discouraged, if not outright disallowed, PC's with "evil" alignments. And we've always played with an implicit, if unwritten, rule that the player characters do not fight each other. A certain degree of tension between PC's is fine, but no group I've ever played in allowed outright fighting within the group. Fighting the monsters and NPC's is hard enough.<p>So really, I'd blame the DM and/or the group as a whole for even allowing the situation where an evil character was part of the PC group.
This is why I play Lawful Evil, when I play Evil.<p>If I'm going to be an asshole, I'm going to be an asshole by The Book. The (unwritten) Book usually has some rule about not sh*tting where you eat, often phrased much less succinctly.
Honestly, the DM should have stopped it, but I wouldn't want to play with you either.<p>Total dick move. You need to go find a safe space to cry in.