Ignore. The world's full of rude arseholes. If I got offended every time I encountered this type of attitude I'd spend my life mad.
Frankly there are far more invasive, serious forms of conduct on our railways these days, especially if you happen to be female. Like the reason I tend to avoid table seats after having the 'leg brush' and being filmed/photographed by the creepy guy sitting opposite. Or the unwanted touching. Or (in any seat, you can hear it everywhere in the coach) screens blaring and no headphones, which so many people today deem acceptable.
As for Friday and Saturday nights, they are as good as no-go zones. I've experienced: a raucous inebriated man throwing up. A man sitting across the aisle from me in a completely empty coach and nearly empty train. I had to get up and move nearer to the only other people on the train, who were two coaches back. Why would anybody do that, if their motives were completely innocent? The guy who circled me like a shark whilst waiting for a connecting train in a dark and lonely station. He came and stood about 6 feet away from me on the platform (again empty station). I was never so glad to see a train approaching in the distance (and stood well back from the platform).
I'd assumed he was simply waiting for the train, had misread the situation, and it was entirely innocent. But he didn't board. He walked away slowly and even the conductor thought it odd, as he stood for a minute or two watching him go. My relief on boarding that train was immeasurable as the walk back home from my neighbouring station is pretty lonely.
A sense of entitlement, huffing and puffling is neither here nor there to me. It's very easily ignored.