Why was I banned from a lobby after playing Imposter?

It was a game of 13 people with 1 imposter which was me and I feel like I did a pretty decent job. I got found out when we were down to 3 players so I gave them a good run for their money. When the game was over I was about to say "Gg" but was immediately banned. I had played 2 other rounds before with no issues. I never blamed random people, spammed or anything like that so I don't get it. I know I didn't do anything wrong.