Damn. Goku sounds A LOT more arrogant and cocky in the english translation. I don't know how faithful it is to the original but here is the Latin American translation:
https://www.youtube.com/watch?v=nNwX_cIVO10
Goku: "It's truly annoying" (The Room of Time and Spirit)
Goku: "We wouldn't be able to relax peacefully during the days we have left"
Vegeta: "Mmmh.. Well well... Mr. Kakarot has realized that it is such an uncomfortable room and he seemingly didn't like it!"
Goku: "It IS uncomfortable. But it makes no sense to keep training there if we are going to get the same results. Let's not obsess too much. Don't take this as a complaint, I'm not telling you NOT to enter that room. It's clear that you can still become a little bit stronger."
Vegeta: "What did you say!? You are an insolent! That comment you just made, I find it to be imprudent! Are you hinting you are a lot more powerful than I am?!"
Goku: "Yes. I am stronger than you."
Vegeta: "WHAT!?"
Goku: "Well! I wish you good luck! See you at Cell's Tournament! Gohan! Let's go!"