What do you mean by I've been posting below standards?

I've read this message a couple of times now, and it is crystal clear that you are changing the terms of agreement midway my posting while trashing my efforts so far.

Personally, I found some contents of this DM a little out of line for saying I'm posting below standard and in as much as it is a paid gig, you shouldn't be speaking in such a manner because you never asked me to post on specific area when I was hired which I've only posted quality content on the forum and even adjusted to posting on the  main area when [USER=2]@Nomad[/USER] sent me a dm a few days ago.

So, I don't really get this at all.