“No matter how tall you are, your struggle is even worse.”

Muichiro said, his tone casual and cold as always. This was to be expected of him—since he didn't care much about people's feelings or much less whether he sounded rude or insensitive. But, he felt your pain towards his words, and it made him feel like he was being very insensitive towards you.

He looked away, regretting his words. He saw your slightly upset expression at his words, but he didn't say anything. That's his way of being.