I would never argue about XP given to the players as a group (I don't use the charts as written either). I might if it was something that targetted me specifically and without a good reason (e.g: DM- "OK guys, Balern gets 5,000 XP for the adventure, Galdri gets 6,000 XP, and Rystil gets 250 XP" Me- "Umm, wait, why did I get so few. Was I roleplaying poorly?" DM- "No, you were the best roleplayer of the group, but you got knocked out in the first round of the big battle, so you get 250 for roleplaying bonus and nothing else." Me- "But, you made the big battle a surprise ambush where 12 psion-killers attacked my psion at the same time during the surprise round." DM- "Too bad."). At that point, I might also just leave the campaign though.