Although I don't approve of the counters, it does seem like the rule was lifted from the main rules page.

Every moderator interprets the rules differently when it is not explicitly stated. Of course, if it is a common issue, and there are varying results from moderator to moderator, then we will discuss the matter in private and decide on set course of action. I personally find idiot/moron counters rude, insulting, and down right unnecessary. In my experience of looking through countless outpost trades, these counters accomplish nothing. I find these counters in violation of these rules:

Main Rule #1: No spamming. This rule applies to both trade notes and offers, where spam is considered:
• Rudeness. Derogatory statements made regarding the value of the trade or listed prices.

Main Rule #2: No insults. We do not tolerate any kind of abusive language or general rude attitude towards any users.

(Source: Rules Page[www.tf2outpost.com])

My reasoning behind this is because if a user makes a legitimate offer on a trade, and then the trade owner increases the idiot/moron counter, then the trade owner has indirectly insulted the user and his offer. This is both in terms of the value of the item(s) offered and the user's intelligence. People are always going to make offers outside your personal guide lines for offers in the trade notes. This is not a violation of any rules, and having an idiot/moron counter is some people's way of trying to disrespect offers left on trades which they cannot report.

It is clearly stated on the FAQ Page[www.tf2outpost.com] a user cannot report offers he or she does not like or do not follow the preferred offers a user has outlined in his or her trade notes. Quote from the FAQ Page:

Someone didn't read my trade, and isn't offering to the standards I've set. Can I report them?

No, you may not. We don't take any action on posts that don't break our rules. If you don't like an offer somebody has made, then please just hide the post yourself. If the post is in violation of the rules, then you may use the report system to have a moderator deal with the matter.

Yeah, I agree with you Baloo. Also, it's an easy way to start a flame-war as the user whose legitimate offer got rejected will feel offended by the increase on the idiot/moron counter (and then will possibly start spamming on the users trade out of a need of revenge).
I would like to mention I didn't want to call the moderator in person out (reason why I haven't mentioned his name).
But I just thought it would be better if there was consistency between moderators regarding this issue.
The moderator has dealt with the issue and I'm going to assume that means if I come across such trades in the future I can keep reporting them.
Thanks for the fast answer and for dealing with this situation.

Asphalt.