i can't believe that a sasaeng fan would just walk up to Xiumin at a fan meet and said that he was "fat" before "Wolf" and he looked better and to "keep at it"

ok

first of all. 

exo are idols; but that doesn't mean that they're perfect human beings. 

They have their flaws/imperfections just like us.  

Nobody's perfect. 

That doesn't give you the right to point out someone's flaws/imperfections that they could be self-conscious about. 

(from a post)

To Xiumin:  You're not fat, you're perfect just how you are. 

To Kai: Your skin color is gorgeous. It suits you well and it's very attractive. 

To Luhan: You're not feminine. You're manly and masculine no matter what anyone says.

To Kris: Your drawings are adorable. Sure, they're not the best, but they're childish in a way that makes it cute. 

To Sehun: Your lisp is super cute. Who cares if you can't pronounce an "S"? It sounds much cuter as "Th" anyway. 

To Chanyeol: I love your little eye twitch. I think it's adorable to see when you laugh. 

To Suho: It's ok to be scared of a lot of things. I'm scared of a lot of things too, it just means that you're human. 

To Tao: You're incredibly handsome and the circles around your eyes makes you look like a cute little panda. 

To D.O: Your height is perfect just the way it is. I'm happy you're not super tall, it wouldn't match your face. 

To Baekhyun: Your light dance was awesome, okay? Good for you for knowing how to party at home. 

To Chen: You're a great dancer. Sure, it's not your strongest point but you're still really good. I've watched you during practice videos and you're really good. You're way better than me, for sure. 

To Lay: It's okay that you're forgetful. We're not all born with photographic memory. It's okay to forget things. 

To Exo: You're wonderful people. You're kind, talented, patient, and you're hard workers. I love you all so, so much and I would never want to bring you guys down. You see insecurities, I see a beautiful, unique qualities. EXO HWAITING!

To Everyone: If you think it's ok to bring someone down for any reason at all, you're wrong. We are all human beings and we each have our flaws and insecurities. Get over yourself and don't you ever try to bring anyone down.