What is the meaning of the phrase that's all there is to it?

Answer 1

This is an expression which is a way of saying with force - "and that's all; there is nothing more to it than what I've just said." So, for example: "We are going to the ball game now and that's all there is to it." Or "They think they are better than us, but the only difference is they speak with a posh accent, and that's all there is to it."

It effectively means - there is nothing more to say.