OMG. My heart goes out to her child - poor little mite, he doesn't stand a chance. How was that allowed to continue. Someone should have pressed the alarm button.
Watching it a second time I've come to the conclusion there is a good chance she's off her face and as her child doesn't seem to be too upset by what's going on, her behaviour and language is obviously not new to him. Poor lad.
She was lucky someone stopped that lad behind her from doing what it looked like he wanted to do.
I do feel for the child. He needs to be in care, because he clearly isn't cared for at the moment. The woman is placing herself, and therefore him, in great danger. In fact to some extent she's hiding behind the child, which is reprehensible.
Suffice to say that most British people are decent, and no decent person thinks or speaks like this ...