Why do you feel being a vocal feminist is at odds with being rational?
I see no problem at all with a rational, vocal feminist. Many people enter the latter category after considering the issue with rationality. It would be insulting towards those people to assume they didn't enter into it rationally.
Something being insulting to someone is not the same as them being offended. I am saying, you are insulting those people, disrespecting them, because they are not irrational. Have a good day and hopefully improve your awareness of other people's faculties.