mpotss

It appears the user mpotss signed up to the forums for no reason other than to give me negative reputation. He signed up, made no posts, disagreed with one of mine, and hasn't returned yet. Maybe it's too soon to make a call on this, but if I'm right, come on now, grow up.

you are correct. mbgare is mpotss (the same IP). feel free to send ticket via http://www.developershed.com/esupport/index.php and ask the admins to ban him, it's illegal to have more than one account, especially if the second account was created just in order to disagree.
anyways, when someone disagree with you, you can simply PM him/her if you feel it's not right. usually we won't interfere with personal conflicts unless it's extreme.

His rep power is zero, so there's no harm done at least.

yeah, but it's irritating to have someone disagree with you, especially when you are correct and only trying to help. in second thought, maybe it's not really the same person but rather his friend, using the same computer. but still, it's not proper. as I said before, it's best be solved in private via the private messages. if you think he cross the lines, report it and he would be dealt with.