I have read/heard at many places where Goodbye is not good. It is a final remark on that very harsh moment.
Scene #1: Mike and Sarah are in good relationship.
"Hey honey, see you tomorrow. Bye!"
Scene #2: Mike and Sarah are now about to break up.
"I don't want to see you anymore. Goodbye!"
You get an idea? The given example is in the context of a relationship but it can be anything. Say friends getting angry at each other and decide not to talk forever. Earlier, they used bye and now, there is final goodbye.
In simple words, is goodbye a final bye?
Best Answer
Goodbye can be used as a final farewell when someone is ending a relationship or walking out on someone. It is a more formal word than bye and thus makes sense in this context. Also, when slamming the door and walking out on someone, a robust two-syllable goodbye adds strength to the nonverbal cues.
But bye, because of its informality, can be used to express disinterest in someone. Okay, bye, I don't even want to waste a second syllable on you.
So it is not that either word is always worse than the other.
Goodbye is the customary leave taking and while friends may shorten that on a daily basis to other, less formal forms including bye bye (common in AmE), there is nothing inherently "not good" in the full form.