Have you ever fired a real weapon?
Sure, a woman with an m249 is going to be stupid. And for the record, even though Arnie did it in Commando, no one is going to hold an m249 while standing up firing. I think most women would struggle with an M16. But an M4 or an AR15. Or even the Austyr that our military use. These are light assault rifles that could be carried and fired by a 13 year old girl.
For that matter, look at this shit. This chick is 10. She's a professional competitive shooter. At 7 she had no issue handling an assault rifle. You have to be either completely ignorant or just sexist to think a woman can't handle a weapon.