Extremely doubtful. Hermione and Ron, Neville, Ginny, and the rest of the Weasleys didn’t become cruel. Petunia, as we saw in Lily’s memories was always cruel to Lily once she was identified as a witch. And, finally, the first chapter of Sorcerer’s Stone makes it clear the Dursely family hates anything out of the ordinary. They’re just ignorant and hateful… can’t be excused by a piece of Voldemort’s soul.