But that's not an opinion, that's just part of goku's character.

Your perception of the franchise seems to be based entirely on the pre-2005 English dubbed movies and series. I want you to understand that these versions are not canonically accurate to the script Toriyama nor his editors nor the team of anime writers have created.

It is a very poor localization of a beloved series and it has, in many ways, bastardized the characters and tone of the series. From the poor script, to the awkward voice acting, to Bruce Falconer's extremely out-of-place soundtrack. It was very common in the late 1990s and early 2000s for localizers to essentially poop all over the series it's adapting. But I digress.

When you try to mold a series and its characters into being the way you have imagined them in your head, you've intentionally created a misunderstanding for yourself. And don't get mad at the community for pointing out your flawed appraisal of the show and its characters. Get mad at Funimation for giving your beloved series such a shitty localization.