Because Many kpop fans are hypocrites themselves they say they like everyone don't be fatphobic etc etc don't judge looks etc. You know they wouldn't have said anything if that guy looked like Jungkook with the muscles and pretty face. This "scandal" would never have happened these fans would be writting shipping fanfictions about this instead.
Well.......... no. Because I did not dream out that there was 30+ page thread on this forum about Jungkook trending #1 in Korea as sexual harasser because he "dare" to pat his friend butt (as a passing greating mind you). And one of the users of this forum still active till this day wrote and publicly posted fanfiction depicting Jungkook as rapist.