From what I can tell, Graham is very unpopular and hated for whatever reason. His infamy makes me want to be his friend even more. I know what it's like, Graham my boy.
I welcome all villagers to my island. I don't dislike any villager. Many people seem to like only the super popular ones, such as Marshal, Judy, Raymond and whatever.
Recently got myself a FB and joined an ACNH group. Wow, they get real catty with their choice of villagers over there. "Ewwww you like Graham! Oh em gee I hate him so much!!!"