I kinda hoped you'd post a video, I'm not familiar w EXO members persona
But yeah, a lot of people can't take that people can be cute and adorable at any age or gender, it's just different kind of cute, not always childish cute
As for aegyo, I don't think intl KPop fans ever really like aegyo, it's a different culture w Korean
But also kinda given for male idols bcs they're typically bad at it, it's too forced, not the kind that'd make your lip curls up unconsciously
My rule of thumb is, if their first reaction of doing aegyo is doing baby voice, they're not *that* cute (or just straight up cringe)