Sexism will be everywhere, regardless. What makes a difference is that some people point it out in some situations and some don't even bother in the first place. As far as I'm concerned Serena's meltdown is highly unprofessional.
I agree with Felipe, you should go into these types of sport organizations completely aware of the fact that you will be looked at as an object. This is a byproduct of the fact that you chose a profession whose criteria is measured by your physical ability and appearance.