Also some men have a fear of women with attitudes and strong opinions therefore they attempt to discredit or make light of any discussion started by such women. Not sure who is who or any is either but that is my take on it.
Consider that sexism, racism, bias, maliciousness, etc. do actually all fall under the banner of "attitudes and strong opinions". This is absolutely not intended as a criticism of your terminology that has admittedly been brainwashed into all of us. I just want to make sure people don't use it to obfuscate what are plainly bad things.
I don't see why anybody should be tolerant of a double-standard of any sort, especially if we consider ourselves liberated men/feminists, instead of ones that are just convenient for the occasion.