The Christian equivalence is interesting. I'm a Christian and have been around MN for years, on many threads where I've been mocked and derided about my imaginary skyfairy friend etc etc, told I must be of low intelligence. My very identity has been under attack, because my identity is wrapped up with my faith.
Now I have also had great interactions with people who don't believe - respectful, even funny (I remember @ErrolTheDragon from this thread for some of these.) I've been gently challenged and asked to provide evidence for any claims I wish to make. All fair enough.
Now I could easily say that these interactions - both unthoughtful attacks and thoughtful, educated challenges - are attacks on my identity and they erode it. I could then say that everyone should just stop making any negative comments at all about my faith - but more than that, they should start to make my faith claims for themselves. They should recite the Nicene Creed and mean every word, because if they don't do that it's mean to me and erodes my identity.
I could ask for those things. I could try to make sure that if people do not do these things they are torn down as heretics - and this happened in the past, to every thoughtful Christian's dismay, just as we are dismayed at some of the stuff happening in the US under the Christian right (ugh).
So I see the equivalence, because here we are seeing the formation of a new religion, a new forced creed, a new witch-hunt, and feminists are the big nasty witches who do not comply.
I do not want anyone to forcibly believe my faith. It goes against everything I believe. I do not want anyone to have to partake in anything to do with my faith if they do not want to (and yes, I've observed all the issues with faith schools, HOL etc.) I believe in free speech and freedom of choice for belief, and what we have here is a system that forces people to bend the knee to a belief system they don't believe in. For me, then , cis is not just a word, but the tip of an iceberg.
And I will not comply.
I am sorry your friend feels sad when he hears those words. I feel sad when people mock my faith too. But I can take it because other people's opinions do not shake that faith.