Sitting in a hotel lobby yesterday afternoon with a girlfriend sheltering from the rain. We were having tea and scones.
Next table was a couple who were middle eastern in appearance (relevant because possible cultural difference).
The guy did that horrible snot sniffing thing then hawked a gob of mucus casually on to the floor next to him and carried on eating.
I managed to restrain myself for all of five minutes before handing him a napkin as we left and asked him to clean it up.
He took the napkin, looked at the mess and put the napkin back on the table.
This was a 5 star hotel in Mayfair.
I don't think I was unreasonable but told dh and he said I should have just ignored it or asked a waitress to have it cleaned up.