Swiftdragoon I've been reading Betrayed and Broken Hero story and I got an idea from this.
As a boy since Middle school everyone thought that Izuku was powerless as his power didn't progress. The girls (Class A) felt bad at first as they started to date him during their last year of Middle school. After everyone made it to Ua and their second year had started the girls (-Momo) had cheated on him with the boys of Class A. After it they were caught as they looked at him without a care they started to spread rumors of him being abusive and a cheater which soon came clear of Momo herself which made everyone in the school hate them. After Class A was hated by the whole school they had become something that nobody even thought they would as they sent him to another dimension as they didn't realize that they sent Momo with him.