Stripping the thread right back to the OP's original question: Yes, of course they should have been reported.
I do wonder though, why the Op didn't feel she could deal with the situation herself. Someone swimming under me, would freak me out, and I would have shouted "Oy", shook my head etc. Universally understood, I would imagine.
But I guess, hindsight is a wonderful thing.
Fwiw, I think we are going to have enormous problems in areas where refugees are re settled in the UK.
We are taking men from Countries where women are completely covered up, and then plonking them in the middle of an episode of Geordie Shore.
You'd be hard pressed, to go out in any town centre in the UK, and not see young women, totally plastered, falling over, showing their underwear, being sick, peeing in the street, getting their Tits out.......how are men who have never seen such behaviour or women dressed this way, meant to process this?
Obviously, it's not acceptable to attack such women, but will they ogle them? Yes, I am sure they will. In the same way, that if I had never seen a naked man, and then you dropped me on to a beach where all the guys wore Speedos, then I'm sure my eyes would be popping out of their sockets.
We are expecting people from totally different cultures to integrate - it's a huge ask. And it's no-one's fault. It's just how it is.
Regards what PP referred to, about Asian men seeing white women as slags.....I dated an Asian man when I was in my late teens. He told me himself that our relationship would NEVER progress, as white women were seen as girls to shag and to never take home, and that he would be marring a "good Asian girl". So I left him. And that's just what he did. Married a good Asian Girl. 