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!!!"