Mic-Nificent
I didn't eat nobody
It's more like he and Vegeta completely switched personalities. His ego is getting bigger and bigger and he has no interest in doing anything else but fight and will do anything to chase a worthy opponent. Meanwhile Vegeta is out chea spending time with baby mama and not even training right now.
Goku has been on this bullshyt for a minute though....Look at how he behaved during the Cell Games, he gave Cell a Senzu bean because he was so confident Gohan would body him and he wanted to see a good fight. During the whole thing with Majin Buu Goku was playing around, he held back during his fight with Vegeta and didn't take out Majin Buu when he had the chance because he wanted the kids to do it. Hell even after the fight with Kid Buu Goku was asking King Yema to resurrect him at some point just so he could have a good fight.
Goku has been a bum ass stupid muthafukka, it's just people forget how he was originally portrayed in the manga.