Now it says there must be physical contact, but the cop would probably just bump into you to get the charge. Look at what happened to Adam Kokesh during the Philadelphia Smoke Down Prohibition event. They claimed Adam assaulted the officer when he clearly just bumped into him and was trying to gain his balance.
These people take serious things like assault and water the definitions down to suit their corrupt MO.
EDIT: Tangential, but Kokesh was just arrested again during Smoke Down Prohibition D.C.
Some places will charge you with "addressing words to officers". The real problem is a cop can arrest you for anything and call it obstruction of justice. And then either the prosecutor will reject the case or you'll get charged and have to spend $2000+ to plead not guilty. Or pay an attorney $250 to get a plea deal of the lowest possible infraction.
There are zero repercussions for a cop falsely arresting you and no one cares about the truth or justice. Just pay to make it go away.