LB: “2) Isn’t it? Wasn’t it? Isn’t it?”
I think Meno’s point is that it’s not technically assur for men and women to sit in the same section of the bus.
However, there are halachic problems that can arise if you don’t have separate seating. For one thing, there are women who don’t dress tzniusly. And for another, if you are a girl, you don’t want a strange man sitting next to you on a bus, v’hamaivin yavin. And it’s not always so easy to just stand up when someone does sit next to you.