The front page of SAIDIT seems to have a lot of men who aren't buying gender ideology, we can post there.

I've had a lot of luck introducing people to GC feminism by bringing up the attack on JK Rowling. It's a good way to segue into what she's saying and why it makes sense, and then, after the person agrees with you, you reveal that Rowling's thinking is basic GC feminism.

A lot of forums for other things, like gossip, or even IIRC gardening, sometimes have a political or current affairs sub.

I don't know where you are, but in the US many people are on this neighborhood forum called Next Door. I'm not because I feel like I know enough about my neighbors already, but I think Next Door sometimes has political/ current affairs subs.

My area has political rallies relatively frequently and I talk to people at those too.