Everyone's pissed because I got a nat 20 on something silly, then stole the treasure while the party fought for their lives

4chan green text style. Be me: a shithead gnome in a dwarven cavern, who was covered in slime from an orchid jelly. Jokingly roll in dust and grime to "camouflage" myself. Nat 20. Now when I press myself against the walls and stop moving I'm invisible. Shortly afterward trigger two more orchid jellies. Me: becomes one with the wall. Jellies move past and attack the rest of the party. I sneak through to the treasure room and take all the loot. After party kills the jellies. I blend to the walls and re appear behind them. Sorely disappointed that theres no good loot in this cave. In game, everything is fine. Meta game: everyone is glaring at me and we call an end to session for the day