Physical coercion simply one in a long list of tools predators have. This woman has been grooming the kid since he was seven years old. Look at her now-deleted tweets, along with all the movies they've been in together.
We're talking about a child who had grown to trust and depend upon this person, who had been manipulating him for years, culminating in rape and a selfie to celebrate it.
You have no idea what may have been going on in the kid's mind. Maybe he thought that she would end his career if he didn't submit. Maybe he just flat out didn't know what to do because these advances were coming from someone he trusted, someone with whom he'd had a clear and publicly declared mother/son relationship. But to dismiss all of that based solely on the assumption (and yes, you are assuming) that she wasn't physically imposing to him is blatantly stupid.
I don't know anything about you, but I'm going to hazard a guess and say you're one of those people who would scream bloody murder if a woman ever felt pressured into having sex with someone when they felt uneasy or just unsure about it. But when the genders are inverted you slam on the brakes and talk about physical force.
Emotional dishonesty and manipulation are far more malevolent and lasting indignities than getting beat up