I'm going to throw a group member under the bus and be angry that the consequences they experienced were not as severe as I thought they deserved
That seems unnecessarily mean. Why would you throw someone under the bus?
I feel that revenge is sweet
Malice towards a group member leading to throwing them under a bus is not the way to handle a dispute. Set aside your desires for revenge and work on finding common ground with your fellow group member.
I don't like the way they did things and I was mean to them.
It's normal to have disagreements with others and to not agree on all of their methods. However, you should express how you feel assertively and with respect instead of seeking revenge.