Can someone explain to me why is it weird for shouma to have gas lighter?

shouma is lazy and gas lighters usually take a lot of effort to refill and use so kirishima is pointing out shouma uses the gas lighter because yoshino gave it to him

Eh idk if people need to refill their gas lighter ._. And I thought using safety matches would take more effort than gas lighter

yeah they're actually a huge pain in the ass to maintain haha. but they look cool