Grossly unfair to blame 'foreigners' for this.
Some footballers do it, some youths do it, some middle-aged men do it, some old men do it, some foreigners do it.
I hate it. It is an offence to spit in public and I wish it could be enforced more.
Although I do believe it was the public service information films on tv and cinema that was more effective in stamping it out in the 1950s than fines. Other people were quite vocal in their disapproval, at a time when it seemed to matter what people thought of one.