He is supposed to be a sports expert. Is he not aware of the well-known facts that the top women's football teams can be defeated by a team of good high-school boys, and so on?
I have to give that some context. The best women's club sides in the world (and some national sides), as part of pre- or mid-season training, often play behind-closed-doors games against club academy teams of U15s - not just random 15-year-olds. (I know you didn't mean that, duc748, this is for lurkers.) The reason for this is to give the women a physical and mental test beyond what any women's team can offer.
Typically, the women's team will lose, sometimes heavily - the first time. They play them again, sometimes twice more, and then they win. They win because they have got accustomed to the increased speed of players and their passing of the ball, the greater upper body strength when in a tussle for possession, their higher leaps, faster reactions. They have learnt how to compensate for the physical disadvantage and use their experience and more sophisticated "football intelligence" to out-think the stronger and quicker boys.
As soon as they can beat them comfortably, they move on to playing the U16s. Then U17s. Same process - lose the first time, maybe first couple of times, then win. Sometimes they keep going to U18 level, but never higher because there is no point. By that age, the boys have sufficient non-physical attributes to make it impossible for the women to compensate. And there is a safety question of course.
What the boys get out of this is the chance to learn about the game and matchplay in a practical setting, from players who are far more savvy than the boys' peers in the academy leagues, who are totally professional in attitude and proven winners. Even at U18 level at a top club, the majority of the youths will not even make it to a high level. The women they are playing against already have reached the pinnacle of their sport. The boys cannot get this sort of experience by playing against elite men's teams because it would be unsafe (for U15s/U16s) and they would be totally outclassed and learn nothing.
And as a bonus they learn to respect women!