Yes. He holds grudges like no one's business. But his anger is pretty restrained because Peridot is also His Thing, and as long as Peridot has nothing to do with hurting Lloyd again, it's easy to focus on the other culprits in this situation: namely Ruby. We should probably be glad that Peridot won't let Ratatosk seek revenge via games.

How does Nick feel about Ratatosk's fit right now?