Your argument is disingenuous. Some groups are unpopular for good reason - because they do bad things, or make society worse for everyone else. When these groups are treated in a negative manner by society, it is proper and healthy, as it helps to discourage the groups spreading.

If you were to hear someone at a party loudly proclaiming the inherent criminal nature of blacks, would you afford him the normal respect upon encountering him later? Would you be terribly upset if you later heard that his web page had been hacked? I think not. He's not from just another group, one which happens to be randomly unpopular. He's from an inferior, dangerous, poisonous group and the more society can do to make such groups feel uncomfortable continuing in their ways, the better.

Christians, I'm afraid, are one of these groups. Even today, in 2009, they are continuing in their insane anti-science, anti-education campaign to throw the world back to the dark ages. Attempting to delegitimise evolution. Denying the fossil record and the age of the world, and by proxy all of geology, astronomy, and many other sciences. Campaigning against equal rights for gays. Opposing important medical research. Trying to weaken the boundary between (their) church and state. Encroaching on free expression. The list goes on and on.

It benefits society for damaging groups such as this to be reduced and one day eliminated. One of the tools we have to do this is that of humour/humiliation - to turn the group into a laughing stock. 4chan are simply the volunteer actors in this instance. You might not approve of their specific methods, but it's a job which needs to be done one way or the other and anything is better than nothing.

"Two millenia later, Christians are the new Christians."

Two millenia later, it's a disgrace upon humanity that there's still even such a thing as Christians. But yep - still whining.