I don't understand why there is so much hate against BTS' RM?

Our beloved leader RM is one of the most intelligent and diligent members of the K-pop industry and there is no debating that. He has been nothing but a supportive hyung to every member regardless of their age, as mentioned by Jungkook. But, it's just beyond me why so many solo stans of Jungkook or other members' disrespect him. From the beginning, there have been people who made fun of his looks and dissed him and still do for no apparent reason. They shouldn't forget, he is the leader!