Okay, for the countless amount of times I've taken someone’s picture without their permission, as far as I can remember.
I've only ever had a hostile reaction three times.

This was one of them.

I was passing a crowd at a bus stop, I waited around them to see if anything would happen or if any interesting characters were about.

I saw this lady look at the sign, sometimes because I shoot Manuel if I haven’t pre read the ambient light for that particular street it takes me a second or two for the reading. Before I focus and expose.

People who shoot on automatic take photos.
People who shoot on manual MAKE photos.

Anyway where was I, ah yes her son (I assume) also at the bus stop saw me.
He approached me and told me I was a dirty c*@t, and he should kick my ass.
I told him, I had no idea what he was talking about.
You took her picture I saw you.
I replied back you should be flattered I took her picture, some people pay me to do that.

With that he hurled more expletives at me, as I started to walk away someone had to restrain him.

Was it about sex why he was so angry, I think so.
I think he totally over reacted, but he looked like a very angry guy even before I took the photo.

Any who taken with a Nikon f3, 50mm lens. 1/125 @ 5.6.
Neopan 400 dev in xtol. Ratio 1:0.
No cropping what so ever.

P.S At the moment I now no longer shoot street involving posters, I just thought the story behind it was funny.