What do you care about the opinions of strangers? Gender stereotypes exist (and often have a very logical basis) but if the laws in your country are not discriminatory and everyone has equal rights, then you should not care about other people's opinions. The easiest way to stop suffering from stereotypes is to stop paying attention to them.
Exactly, we cannot please everyone but of course women have to fight for equality and for their rights so if they feel mistreated they can always file a case. In gambling, anyone can go as long as you have the money no matter what your gender is, if the laws and religions allows you to gamble then there should be no discrimination here. Just ignore those who throw hate at you and just enjoy gambling.
You can’t please everyone, so I decided to please only myself
This is the most efficient approach and solves most of the problems.
I think there is no law that is trying to discriminate women against men, all have equal rights and opportunities. However, when it comes to gambling, its mostly dominated by men not because they have more luck, but maybe because men are more risk takers and less impulsive than women. And they are more socially anxious than women. Other than that, i don't see valid reasons why women should not engage theirselves in gambling. If they can stand on what they believe and become independent, gambling may still be a good avenue for them.
The predominance of the share of men in gambling is easily explained by biology. They have more testosterone and other hormones that increase aggressiveness, desire to win, risk taking, etc. I read a study where gambling was compared to hunting (in terms of the physiological effects that appear in the human brain) and there were a lot of similarities. Among other things, there was an explanation of gambling addiction by the fact that during the hunt, when the prey is already very close, the brain mobilizes all the forces for the "last push". And this is very similar to how a gambler is trying to win back with all his strength and money, because the casino always creates the illusion that the win is very close.