I've seen a lot of subjects in which men are unfair or unequal but a big one that I've not seen so much of is the life expectancy. It is a well known fact (at least in my surroundings) and almost everyone knows and accepts that women live longer than men. I have seen much about higher male suicide rates but I think it is better to go to a big stat that everyone knows and acknowledges. I think that if you show people this fact and tell them that this is not something biological (which it isn't) but something that is caused by society, higher suicide, dangerous jobs and so on, that you can create an easy gateway to really talk about mens rights and how society treats men as disposable.

Now if the counterargument is used of men are more reckless than women then you should really just walk away. (this is a strawman sorry but it still happens that people say this)