I was walking home from the library

I was walking home from the library (Tuesday afternoon), when I heard someone saying “oh sehr schön”, so instinctively I looked up to see from where the voice was coming, but I didn’t think it was addressed to me, I was just curious. When I looked up (I was walking looking down as I often do), I saw on my right a man – around 40-50 years old – looking at me and saying other things in German – I didn’t understand -. I looked at him with a shocked – and probably disgusted – face but I didn’t stop. However, I felt his eyes on me while I walked past and he said a few other things in a language I didn’t know.