I'm going to honk at slow drivers
What are you going to do if they start honking at you?
Who? People who honk at me? I'll screw them up from the inside
Road rage is never, ever okay and you need to keep yourself in check before you truly hurt someone. Letting your anger out on the road is extremely dangerous and you can harm or kill someone due to your idiotic temper.
What's wrong with it?
When you are on the road you need to be courteous to other drivers. Getting too angry with them is never helpful and can often cause accidents. If you don't like the way they are driving you can go around them.