Nope. Go back and reread your statement. You said 'I sped up to squeeze in'. You should have put your blinker on and moved over instead of trying to get ahead of one more car. Yes, he probably was a pissed off driver, just like you for trying to 'squeeze in' in front of just one more car merging at the last moment.
What you really need to ask yourself is, how much time am I going to save going around this car? The answer is maybe 5 seconds total. The whole 'getting around that car' mentality is what causes traffic. Your saving yourself 5 seconds can cause a chain of people putting on their brakes and causing a stand still. So you can save yourself 5 seconds and cost everyone behind you much more, or you can be selfish.
You really should have merged much longer than 600 feet before the lane ended. There are always plenty of signs long before that.

I only drive slow in a merging situation because I am being courteous of other people and trying to lessen the traffic situation.

And I have no problem letting drivers like you in ahead of me because I know I just saved a whole line of cars behind from slowing down like what happened in the situation you mentioned previous. Nothing personal.