Why does he not believe things I say?

We've been dating each other for a year now. He's the first man in my life. The issue is he doesn't believe in anything that he himself doesn't suffer from. For example, he'd never believe I can be subject to workplace/ street harassments since as a guy he has never experienced it. Similarly, a lot of things that girls have to go through and guys don't - he denies to be true. He also tells me how his sisters and female friends don't have similar issues and definitely it's a problem with me.

He also recently when we were fighting over his denying my experiences, told me that his female best friend, in the initial stage of the relationship told him reading my texts that I'm not a good girl, using 'tricks' on him and he should avoid me.

Am I really not being able to understand the red flags?

Why does he not believe things I say?
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