Outsiders prob has something to do with his grandpa's suicide. Just a hunch
had the same thought that someone who came from out of that town conned his grandfather. poor guy
but that's doesnt justified his action. like i do understand the grudge against the outsiders ( if its truly work from outside) but hating on sakura solely because he's an outsider is more like people hating on chinese people because thats how covid starts and spread (sorry for the very poor choice of an example)
im assuming he doesnt really know what sakura has done (assuming hes mostly visting the hospital) + probably has had alot of encounters with people who have sinister intentions and believs Sakura is like that too? Only time will tell tho
What he hates Sakura for being a "Outsider" ??? Like he's a sad boy whos only family he has left has dementia, but how is that Sakuras fault?