How to react

Sooooo I was driving today. Sorry, but a lot of these posts will start like this. Like Ive said before, I do a lot of driving. Its a lot of driving in different locations, so I'm not seeing the same streets every day. But, I question myself some times. No, not at driving, although aggressive, I feel I'm always on my toes. I do question my reactions some times to other people.
Case in point. Driving home today I could see a guy, becoming a jack ass. Like a drunk chick at a bar, in need of a drink, I could spot this from a mile away. There's a lane that ends, and I'm pretty sure, that most people in this area know, its a lane that ends. ( By the way there's a baby diapers commercial on right now, where three babies are being judged on how much they "load" their diapers, hilarious, but gross) So, back to the jack ass. He gets out from behind me, and gets into this lane that ends. Light is red, so I have time to look over. I'll only point out that if I were to get new rims on my car, I would buy 4, not 2. But that's just me.
So the light turns green, and now I know hes coming over. So what do you do in this situation? Speed up and make him come to a stop risking him just coming over anyways and maybe cause an accident. Which mind you, when in my big, white, construction van, I couldn't care less if that happens. But I'm not one to like having to fill out paper work. Other option is to just ,maintain speed and see how he reacts, which could cause an accident as well. So, I take option 3, and just let that bastard in. In my head I'm thinking "what an ass, basically just moved one spot, what could have that accomplished?"
Thinking too much into this? Probably. But how should I react to this guy? See the worst part is the bastard waved to me. Why? Why wave to a guy, that's knows you basically just moved up one spot, not benefiting you at all. See this is where I wish all cars came equipped with a dot matrix sign on the top of our cars, so we could express how we actually feel, in 15 words or less of course. I mean, I flick the guy off, doesn't really get my point across. But, follow me, if at the next light I could type in " I think you being an ass hat and I feel like you may be a waste to society". Now doesn't that have a much better ring to it then the finger???
Maybe I'm going to far, but I just think people get off too easily. I think if more cars had cow plows on the front of them, we would drive a little differently. Or, or or, maybe if the pit maneuver was a legal action for civilians to take, that would lessen A-hole drivers. Yea, I know, I watch entirely too much "Cops". I must admit, I do like myself a good 'ol tassing!! Seriously, when some one gets out of line, I'm praying they break out the taser! But, back to making people better drivers. That, will never be done. But I think we need to feel like there are more consequences. Maybe if we used social media to present these bad drivers. A page dedicated to bringing forth license plates of bad drivers, and addressing their actions. That way, say a cop pulls some one over for, I dunno, say speeding just a tad over over the limit, the Cop can bring up any complaints. So maybe he was gonna let this guy go, but now he sees that someone reported him for flicking them off for no reason at all. Now the Cop can come back to him, and say "See I was gonna let you off, but not now, now the hammer comes down." Then the Cop tases him. I'm telling you, I have a thing for criminals getting tased.
So how should we react? Just let people go? Continue to just be surrounded by bad drivers? I guess we have to. But I think its up to us to some how, come up with a way to make other people feel like there are consequences for being flat out inconsiderate. For now, I'll just use the finger. Wish it, want it, do it.