It tells them that inclusivity is against their interests. Boys growing up where they are explicitly barred from opportunities due to their gender are probably not going to be very willing to accommodate women in the future. Also things like this has shown to not move the needle, so all you accomplish is drive the wedge between genders even further down.
> I think how Guido wants to spend his time is up to Guido.
And we are allowed to criticize him for it.