First: You're using open source software. Part of the bargain (and the value) of it is that you have everything you need to change it, fix it, upgrade it, or make something completely new from it. All you are asked to do is give credit ... and be willing to do some work yourself if you need more than the gift you were given provides.
Second: Insulting someone anonymously and behind their back? Classy, real classy. At this point, a decent and intelligent person would say something like, "You know, I was upset because I really needed this to work, and what I said was out of line. Sorry."
Advice: if you get into a habit of expressing yourself this way and trying to justify it, at some point you will do it somewhere that you're not anonymous. It's something that could cost you a job, or potentially valuable friends.