"It's not botting, it's AFK training"

It is not on one side or the other.
Nexon is unproffesional for not adressing it.
The players are malicious vermin for taking advantage of it.

Both sides ruin the game.

Please find me any competitive game where players don't exploit any kind of advantage they can get to get ahead. If Nexon doesn't like how people are playing their games, it's up to Nexon to change their games to stop players from doing whatever it is they don't like.