I don't know for certain. Could it have something to do with his parents being squibs? Or not being French?

I think the Beauxbatons professors think some students just need to learn to endure, or cope, or solve their own problems. Which doesn't really make sense when the situation's so mis-matched, but I suppose it might be a cultural thing.

And if you ask me robes are a daft thing to row over.

From,
Hydra