As two people who simultaneously stole the glory of being Cedric's champions, Harry faced an overwhelming amount of malice from the school.
Shuxin herself had many friends across all the houses, and she was certainly capable of standing her ground. Add to that "Old Zhang"—whose prodigious magical power was legendary (which was what Seventh Great-Uncle insisted all wizards in Germany call him)—and practically nobody dared to give Shuxin a hard time.
Poor little Harry was a completely different story. Aside from Gryffindor, students from the other three houses all ostracized him.
Chapter 95