Two guys have road rage on the highway. The OP pulls a gun.
The OP posts online to get us on his side.
The other guy calls the cops right away to get them on his side.

This looks REALLY BAD for the OP.
There is ABSOLUTELY ZERO CHANCE any court will say pulling out a firearm is a good response to an aggressive driver on the highway.
Zero, zilch not going to happen.

Takeaways:
1. NEVER pull a gun for an aggressive driver.
2. If you ever have to draw your gun call the police first. This is important.
For example lets say someone approaches you and says "give me all your money".
You pull you gun. The would be robber runs off and calls the police on you. The police come and you are armed and the would be crook is not. Even if he was he wouldn't keep the gun when calling the police.
Maybe it doesn't have to be a robbery. Maybe it's just someone being aggressive and threatening. If you pull your gun and the other guy calls the police, you have an uphill battle proving your innocence.

It's been a while since the OP has posted. I hope he's doing good.