I agree that there’s something weird going on with that user, especially after seing him writting that response (which I agree it looks aggressive, especially the " leave it to us power users to do the hard work") after an edit by JayCBR, who’s a known mapper in the Greek community. And also it seems this user had 4 blocks based on HDYC tool. And even had a comment from DWG.
I don’t know if private communication has already occured with that user, but would be nice if he/she would come here and talk about this situation.