While it may not be against the law (yet), it is contributing to rape culture. When you argue that the man is "immature", you are excusing him, and as such, you are contributing to rape culture. You are arguing for a society, a culture, where it isn't men's fault if they pressure others to have sex with them. They 'just don't know any better' because they aren't "mature" enough. 'It isn't against the law', is what you are saying, and so you argue "but what if, but what if" to create a continuum of gray-scale cases. That view makes it easier for rapists to get away with their rapes.

To use an analogy, cutting food stamps and denying the expansion of medicaid isn't illegal, but it will cause a certain number of people to die, and it will most certainly cause the quality of life for many people to be worse than it could be, than it should be. Instead of saying that all humans deserve health care and enough food, that is, we should make enthusiastic consent the standard, you are pointing to the welfare cheat, the "lazy bum", and other stereotypes, and using them as a way to derail the work others are doing to make sure everyone has a decent quality of life.

Working to make enthusiastic consent the default in our culture will help create a better society for over half the people in that society, and ultimately a better society for everyone, regardless of gender. In the mean time, those of us that want to change society have to work against not only those neanderthals on the Republican side, but also against armchair quarterbacks and 'devil's advocates' on our own side. So thanks for that.