As long as I can tell a cop to go fuck themselves without being arrested, I don't feel oppressed.
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.
http://www.huffingtonpost.com/2013/06/06/new-york-annoy-poli...
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.