tech you would think its entrapment them reving at you but really its not depending on what you do and what they do. If they rev and you both launch its not say both spin tires then yes its entrapment. If he was to rev to and say you launched spun etc and he stayed still then well you just bought yourself a ticket. You made the choice and assumption his rev was that he wanted to race. Maybe he reved to say whats up or so you would rev to and he could hear your car.
this is how it was explained to me when i asked my brother in law to ask his brothers who are cops
If someone get's you to do something you wouldn't normally do ON YOUR OWN, then it's entrapment. So if someone challenges you to a race and you take the challenge without being FORCED to then it's not entrapment. You were encouraged and you took the bait, it Sucks but not entrapment.