I normally stay seated until it is my rows turn to get off. Guy in middle was antsy and grumbling the entire time, and then completely lost it when I motioned for the row across to go first. He told me I was an ... and I must not fly very often. I thanked him and started to move into the aisle. This made him very angry and he snatched his bag from under the seat forcefully. It got caught on something and jerked him back into his seat. I smiled and said “karma” to him. He broke out laughing and apologized for being a butt head.