Midoriya had less than a child's understanding of the Quirk given to him a few months before his first year of high school. Considering that, he was the least qualified to judge anyone on their flying grace. His classmates had had their Quirks since they were kids. They had spent years familiarizing themselves. When his classmates were learning to apply their Quirks to hero work, he was just learning how to make a move without hurting himself.

"Ah, no. It's just that I wasn't sure if cutting loose like that would get you in trouble here. Back home, using Quirks on public property is prohibited for safety reasons."