This is a handwave.
You cannot believe that both that the issues are totally illegitimate and that they are legitimate.
You're doing exactly what I was being critical of. You're lumping all the criticisms of Men's Rights issues in together to call them all valid, when many are not. You're ad-homing all their concerns and calling them invalid, when many are not. One does not need to agree with or like the MRAs overall to agree that they do indeed have some valid points, and some of the criticisms of them are invalid. Making it this black and white all encompassing when it is not. Take the arguments on their own merits or lack thereof.
Assuming this film maker is operating in bad faith simply because the film reportedly doesn't outright condemn all MRAs and their issues is poor critical thinking, and does not justify the reaction.
You're even making up arguments I haven't made, straw-manning already. Who said you don't know anything about MRAs?
Yes, many feminists thankfully do work on those issues you named, but many also belittle, dismiss, and outright attack the validity of those issues. Do you know that on pages devoted to discussing male rape survivors, we get feminists coming in accusing us of 'what about the men' arguments to marginalize the rape of women? On discussions of male rape, not on discussions of female rape or rape in general, male rape. That behavior not only fails to be called to task from the feminist community in general, it's rationalized and if a male feminist calls it out, he's pilloried and accused of mansplaining, suddenly a dirty MRA. That's probably one reason when it happens, the male survivors of rape walk on eggshells not to appear even a little harsh of the person trying to silence their discussion.
To me it no longer matters how bad this documentary might be, it might be straight up propaganda, but the reaction to it is more important. It shows how intellectually bankrupt pop feminism has become. Attack the arguments, don't just ad-hom out of it. This pisses me off because feminism is actually really important, and to see them behave as Trump supporters, to use your own well poisoning, is heartbreaking.