I think there is a big point being missed here, and was missed in the programme (I've now seen that segment on I Player.)
What we are talking about isn't miscommunication or crossed wires. If you look at the Everydaysexism website, very few comments are not about this. It's bullying, plain and simple bullying.
A 40 something man shouting to a 12 year old girl standing at a bus stop that she has "nice tits," isn't making a social faux pas nor misreading her "signals." A bloke grabbing the buttocks of a women he doesn't know in a bar is not thinking this is the first step towards a loving relationship, or even necessarily a no strings sexual encounter.
In these and the thousands of similar situations described on the site, the men approach the women and girls with the intent of embarrassing, upsetting, intimidating, angering and/or frightening them. For whatever the reason, that is their goal and that is what they get the buzz from.
That is what bullies do regardless of their reason for or chosen methods of bullying. Talking about "overstepping the mark" when flirting and misreading signals is a red herring here. If it were really about that, men would accept a "no" or the person ignoring them, apologise and desist. As others have pointed out, that is rarely what happens.
Regardless of whether the woman ignores them, says no politely or responds rudely, the response from men is too often the same - either they continue regardless, or become hostile. Damned if you do. Damned if you don't.
For those not familiar, this blog explains why it is nigh on impossible for women and girls to muster the "right" response to sexual bullying.