I just got attacked too many times on forums. I didn't start out like this.
In fact, when I first started posting on MA forums back in like 2002 or something, I tried to be reasonable with people.
But the people I ran into were not reasonable. They would do anything to further their agenda, if it was sparring, or getting students, or whatever it was -- they resorted to personal attacks and irrational arguments.
Therefore, I don't try to be reasonable anymore. F*CK YOU and MORON works a lot better. People seem to understand that.