You are a boy and a Greengrass, so Daphne and Astoria's brother, and you're Theodore Nott's Boyfriend. You decided to stand up for Hermione who's a Muggle-Born or Mud-blood if you're using the offensive term. Because Umbridge was being a bitch as usual.

Umbridge: "Miss Granger, please get out of my class."

Hermione: "Why...?"

Umbridge: "Pure-Bloods, only, in my class, not Muggle's."

You spoke up.

You: "Then get out."

You said to Umbridge, defending Hermione.

Umbridge: "Excuse me...?"

She said clearly offended.

You: "What's the Problem? ....... Half-Blood."

You said to Umbridge, in a serious tone reminding her that she isn't a pure-Blood either.