Female customer cringes as old man stands too close in line

While at a check out in a drug store, a female customer cringed in line as an old man stood in her "snog zone". Even though the female customer attempted to create more space for herself, the old man denied the social clue and stepped back into the "snog zone". Before the female customer had a chance to say anything, it was her turn to get served. The old man continued on as clueless as before, not realizing how close he came to being told off.
Defining "snog zone": if you can turn around and the person behind you is close enough to kiss, that person is in your snog zone.