One guy spitting someone is very wrong, but not terror. There is no excuse to spit, but it is a rare occurance. It happens more frequently in Tel Aviv than in Beit Shemesh. Don’t overreact or overdescribe.
In the U.S. and Israel spitting someone is generally a civil matter, not criminal. And if it is a crime, it is a misdemeanor that carries something akin to a fine or a number of hours of community service.