To say that gender is performative is a little different because for something to be performative means that it produces a series of effects. We act and walk and speak and talk in ways that consolidate an impression of being a man or being a woman.

We act as if that being of a man or that being of a woman is actually an internal reality or something that is simply true about us, a fact about us, but actually it's a phenomenon that is being produced all the time and reproduced all the time, so to say gender is performative is to say that nobody really is a gender from the start.

What's the point of being a lesbian if a woman is going to look and act like an imitation man?

You act at being a man, and before you know it, you are one.

I have no objection to a man being a man, however masculine that may be.

Acting is just being a man. Being human. Not forcing it.