Um... due to rules and respect I will not disclose names here, but things are like: in a competition in 2012, Yuzuru was having serious problems of stomach ache during an OP on ice rink, he was so painful at that time but the senpais just kept talking around themselves and no one to simply ask him if he was OK...and recently one "senpai" had commented on Yuzuru's Hope and Legacy, saying it was having flaws such as not skillful and no emotions (I totally cannot understand why because I am moved by this program every time), and there are also some more serious stuff...(better not to say here I am still afraid of what happened back in GoldenSkate)
However there are still good senpais to him such as Nobunari Oda, but a lot more were...
That's why sometimes I feel so bad for Yuzu. He is such an angelic person and treats everyone so nicely, but not everyone treat him nice in return.
awww poor thing, i am pretty sure they are just jealous of Yuzuru's talent. And even with those bad experience, he is able to treat Shoma and other young skaters nicely, it speaks for his character