@NiceGerbil
Not surprised it was s bloke!
They're usually the ones who think oh I'm a bit bored/ she looks nice. I'll go and talk to her! Naturally she will be very pleased...
Obviously going and striking up conversation with s total stranger who is in the middle of eating, and obviously reading etc is very unlikely to be welcome.
I doubt men like that do it to other men.
Did he plunk himself down with you? I'd say 50/50.
This. ^
I am surprised that the YABU vote is so high. I don't think YABU at all @Mummybasketball
I would be a bit irked if I had sat down to a cappuccino and a nice cake, and had my head down, scrolling through my phone, and some random man came chatting to me. I know some think it's miserable and anti social, (and maybe it is!) But people have the right to just sit in peace in a café without chatting to random strangers. And as the pp above said, I bet he wouldn't have targeted a man.
I went to meet a friend for lunch, who I had not seen for 4 months not long ago (in a maccie Ds,) and a random customer came over (after he had binned his rubbish.) He began chatting to us, and stayed there for ten minutes yabbering on about himself. 
I had gone there to meet my friend on her one hour lunch. She had a ten minute trip there and back, so we only had 40 minutes anyway, and this individual wasted 10 minutes of it. Very annoying. 
Yeah I'm a misery guts. So shoot me. 
As @NiceGerbil said further back in the thread (at 01.27;) when this type of random person starts yabbering and waffling on (usually about themselves,) they rarely acknowledge anything you say. Only interested in talking about themselves, and hearing the sound of their own voice.