Went to the supermarket, they just rearranged one of the aisles so now it's a squeeze for two customers to get past each other (but still possible). As I went past a man, he muttered under his breath "seriously?!" but didn't say anything to me. A few mins later I had to get past him at another aisle and this time I waited for him and gave way. No thank you or smile, but instead he muttered under his breath "what you looking at?" At this point I asked him directly if he said something to me, and he replied "no I'm happy" and walked away very quickly!
I wish I had had something cleverer to say!