The question (and others like it) is at best really unthoughtful.
First, there is no reason why a feminist organisation should be actively campaigning against all inequalities based on 'sex', it's addressing specific inequalities for women. That doesn't mean that feminists on the march don't care about violence towards men, or see the connections, just that that part of their activity at that time is not combatting it.
Second, the linkage is disingenuous, as it always is. It's not a numbers game, it's the fact that neither the circumstances which lead to male-on-female rape nor the consequence sof it are the same (although they do intersect with) as those which lead to male-on-male rape (or the legally impossible but I suppose just about plausible female-on-male rape). Campaign groups can work on the intersections together, but a feminist approach would highlight the way gender imbalances in power perpetuate rape culture. Nothing worng with that, activism is selective.
Third, RTN is not just about rape-it's about reclaiming the streets and being free of fear of a particular form of attack. Many men too walk in fear at night, but again the reasons are different.
I'm a man, btw, and am so sick of hearing this thrown at feminists and at feminist viewpoints. If your friend is doing more than trolling he should take the message that some of what is combatted helps end rape culture generally-which might reduce male rapes . And that feminists on the whole think about other forms of kyriarchical oppression to. But feminism is not discredited by taking selective action and having narrower parameters than all inequality ever.
The coastguard exists to stop people drowning at sea. Some people drown in the bath. Drowning is bad and should be stopped. bath drownings don't, however, mean the coastguard is useless or that it is not living up to its principles of saving people from drowning.