" I am unaware of what that discrimination is...."
Well here is a contender that I almost never see talked about. This was the case 20 years ago and I suspect it is still the case but don't know for sure. It is the CPP. For every $1 that men put in they take out $0.50 in benefits. For every $1 that women put in they take out $2 in benefits. It is the most massive transfer of wealth from men to women that I can think of. Were there two separate systems, one for men and one for women, men would either be able to retire earlier than they do now, by 2 or 3 years, or they would enjoy much nicer retirements. Men are, effectively, being forced to work 2-3 years longer than necessary in order to subsidize women's retirements.