Leo had already told Twilight that he is Maximus Kong, luckily, she didn’t get mad at him even with all the horrible things he had done to her and her world, and she forgave him. Unfortunately… not everyone buys the same forgiveness as Twilight.  
 
And that’s what happens when finally tell the truth to Twilight’s niece, Flurry Heart, who has always suspected Leo, then decides to tell her once and for all so she can stop suspecting him, and her reaction to discovering that Leo is Maximus… it wasn’t good at all.  
 
Flurry unlike Twilight, she was pissed at Leo, she yelled at him, asking how he could do this, asking if he has any idea what they went through because of him, all the pain, chaos and destruction he’s done, not to mention the fact that he killed Celestia and Luna and other innocent lives including childs. It was in this part that she mentioned about the childs that she started crying with rage, cause Maximus Kong didn’t just kill adults he also killed childs, tears streamed from her eyes as she continued to yell at him, and Twilight tried to stop Flurry and tries to make her understand that it wasn’t Leo’s fault that he did all this.  
 
It’s really sad to know that that baby who loved Leo is now an adult who hates him deeply.