You said in your edit: Men are relevant and important to addressing women’s issues.
That's it.
And per merriam webster:
prejudice or discrimination based on sex Source: https://www.merriam-webster.com/dictionary/sexism
Your statement in and itself, shows prejudice based on sex.
OK, I pulled out a computer for you so I could see the rules side by side with my post because my mobile client doesn't allow it.
OP came in swinging hot, maybe a little toxic, but there are valid points behind the hot words.
However, OP has shown that they are able to accept other viewpoints from valid arguments (https://lemmy.ca/post/48960508/18080134). So I would argue this is borderline.
I have to say, I have no idea what sealioning is though.
This isn't a "How do I". This is an open ended attempt (with some frustration) to try to under why members of the community do certain things.
That's my view anyway. What's yours?