péngyǒu shuō suíbiàn, yǒushí shì zhēn de dōu kěyǐ, yǒushí shì bù xiǎng ràng biérén máfan

朋友说“随便”，有时是真的都可以，有时是不想让别人麻烦。

When a friend says "up to you," sometimes they really don't mind either way, and sometimes they just don't want to trouble others.