The Real Problem with Parsers

[Aiselia]

So, because (assuming you're playing DPS that day) someone might say something like "Wraith, your dps sux, L2P Noob", I shouldn't be able to say something like "Wraith, you're only doing half the DPS of the other DPS, can you please step it up a bit?"

What I think is or isn't too demeaning is irrelevant. What is relevant is what SE thinks and what everybody thinks. This whole thread might be fine with the latter, but there might be 10,000 people in DF right now that wouldn't be fine with it and just don't want to hear it. Now, whether they're right or not is subjective, but whether they're right or not doesn't necessarily mean they won't put in a ticket for harassment, which SE has to deal with in one way or another, which is time and resources spent on what could be a non-issue.

If you could guarantee that the former would be a rarity while the latter the more common, that would, I'm sure, help in an argument about whether it should or should not be allowed. But you can't guarantee that, can you? There's always the possibility that the people that would say the former would outnumber the people that would say the latter, isn't there? Some people find it difficult to stay civil in a thread on the forum about someone's completely hypothetical DPS that they've just made up. Why should SE expect that those people could stay civil in-game if they rescinded the policy to not bring up someone's DPS?

You can't use a parser

ACT doesn't exist, I see.

Maybe you should consider the factual difference between "can" and "are officially allowed to". Because they quite clearly can, even if they're not officially allowed to.