No credibility at all. There is no evidence of anything. Provide pictures, chat logs or just someone telling you over irc he's abusive.
This is not the right way to make a drama. At all. You need to have a structured argument "this is what's wrong, this is why it's wrong, this is what should change, here is evidence of what is wrong, let me sum it all up with a final statement"
Retry that. Post pictures of him abusing his administrative abilities, or just don't post.