When she talks about the "war against boys", she's talking about the school system. Schools overmedicate and overpunish boys. The system drives boys out of school and as a result, only 40% of college students are male. If an inequality like this went the other way, there would be national outrage.

But it's not exactly a "conservative" issue. Plenty of liberals have written about it too:

https://www.theatlantic.com/sexes/archive/2013/06/stop-penal...

https://www.esquire.com/news-politics/a32858/drugging-of-the...

https://blogs.edweek.org/edweek/inside-school-research/2015/...