Men being skeptical of what women say is nothing new either. Part and parcel of the entire scenario you’ve described in this post.
If a man expressed the same sentiment, would they be as skeptical? This kind of response is so hardwired it happens with the men that love us, too. And with men who don’t even know us, it’s often simply disregard instead of doubt.
It was never that they needed proof, it was only always that they didn’t think it matters that much.