Why Are Domainers Againest Each Other?

I suspect Im not the only person to feel this but why do some domainers have it for each other?

Someone recently contacted Neustar about loads of .us domains I own trying to get them deleted but they didnt realise that I do business in the US - So Im allowed to register these and Neustart dont have an issue with it.

Then next I get a comment on my site from someone called James who doesnt leave an email address that works that states this

"What have you been smoking? You've developed a network of useless webpages with multiple blatant Adsense TOS violations. You've got anywhere from one week to 3 months before google bans you. Why? Because your sites have just now been reported"

Now if they have reported me, fine I have nothing to hide with my sites but why?

Why are other domainers out to get each other?

We need to work together not againest each other!

Regards,

Robbie