I am not denying that, but I'm not seeing how it's connected to me telling the "OMG helping women is sexism" guy that there's a history here that he should pay attention to.
In particular, the historical comparator to nurses isn't software engineers, it's doctors. Take a look at the gender distribution of medical school graduates:
http://4.bp.blogspot.com/_otfwl2zc6Qc/SwyK7qFvLaI/AAAAAAAAL_...
You can see it take off with Title IX, which banned outright institutional discrimination by gender.
A lot of women with interest in and talent for medicine who wanted to become doctors instead became nurses, which fed that historical imbalance. We've fixed the schooling, but we're still working on the outcome; the gender distribution of doctors is still not great: 66% male in the US.
So when this guy whines that there are no organizations helping men become nurses, my reply is that the reason women have historically dominated that field is not anti-male barriers to dudes who really want to be nurses, but previous anti-female barriers in the higher-status profession of doctors (and other things they could have done).