What do you do when a group of guys won’t take your opinions seriously?

This is so frustrating to me. A lot of the time if I’m with a group of people say at a game club or out socialising if I try to input my thoughts in a conversation of guys they either just ignore me or don’t take anything I say seriously. Like I can’t be smart enough to know what they’re discussing. Once I was with a few guys and they were talking about a topic relating to the cosmos and how black holes work. I love this stuff so I thought I’d put my piece into the convo and a guy literally said to me “shh sweetheart the men are talking. You wouldn’t understand this subject.”

I was stunned and just walked away in a daze thinking what did I do wrong?
What do you do when a group of guys won’t take your opinions seriously?
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