so what? idiom informal
那又怎样？
used to mean "it's not important" and "I don't care"
So what if I'm 35 and I'm not married - I lead a perfectly fulfilling life! 我35岁还没结婚，那又怎样？——我的生活十分充实！
"Andrew won't like it, you know." "So what? - I don't care what Andrew thinks!" “你知道，安德鲁不会喜欢的。”“那又怎样？——我不在乎安德鲁是怎么想的！”