The challenges themselves would make most Chelsea fans feel that way. The fact he did it twice shows to me that he's got something against him. They weren't snide or debatable ones either. They were outright dangerous with 2-feet on the same player each time.
Interesting though because I remember several similar comments from Liverpool fans towards Choudhury (which resulted in a lot of hate for him) for a challenge on Salah back in October and he was labelled him in a similar way for something much less than those 2 Aguero challenges!