This is such a weird statement to me. If it works for you, fine, but I think it's bad advice: to demand that not only your boss be active on social media, but to actively pursue your preferred topics on same.
It is unsurprising to me that effective strategies end up rubbing people the wrong way. The reason social media posts work as a filter is because they are a minorly-costly signals to send, and the suggestion that people be expected to do extra work to appear trustworthy, rather than being assumed to be trustworthy even though probability isn't on their side, is going to feel threatening. Privileged men feel entitled to the benefit of the doubt, even when it is women who bear the costs when they fail to live up to it.
This isn't just "my preferred topic": this is my life. This is whether I have a fair shot at promotion. It's whether I have to be 150% sure with a giant pile of citations by dudes before I say anything, or people trust my technical judgement. It's whether I can be most productive at my job, or I have to waste a bunch of time managing the anxieties and insecurities of the dudes I work with instead. It's about whether I have to spend time and energy sending Comey-like memos every week to document the sexual harassment against my female coworkers until they all quit or are fired anyway. It's about whether my coworkers will refuse to speak to me for six months because I made work "not fun" by not wanting to hear about his pick up artistry, and still get promoted. After that last one, now I only work places that don't prioritize catering to sexist developers over catering to me. There are plenty of options out there; there is no reason to settle for anything less than an actively anti-sexist workplace.
Many men treat this like an intellectual exercise: it's not. These days, I only work for the ones who already understand that.
We also exclude programmers who insist on using nothing but GOTOs to structure their code, and sexism is way more annoying for me to work with than GOTO-filled code. You don't really think I should be inclusive of everyone: you just don't think sexism should be allowed to be a deal-breaker. Don't worry, if you want to work at a company that's inclusive of sexists that's way easier to find.
You're projecting and making a lot of assumptions about the person you are replying to.
I find it interesting that this dynamic has so much in common with the deeply religious.