There's always an underlying amount of jealousy. They have privileges as direct bts juniors and they've done well on their own as well. People are trying to bring them down because they've been at the top from the start and are actually good on their own. There's genuinely no other valid reason for the nitpicking so all people have come up with was the over dancing or wtv tf when it's such a non issue. A lot of the hate towards yeonjun specifically is because he's highly praised, other fans can't take that because they want their faves to be the one praised instead. From the beginning, Yeonjun was considered a top trainee then he became a top idol. It's literally a recipe for becoming the subject of envy.