God I hope not.
To give it a little more context, Tobias always called people with good JP skills derp speakers, and Mew interpreted derp as retarded, and was like "really man?"
In the end it turned out he wasn't really that offended and realized there was no harmful intent in the phrase, but Tobias has decided to find new terminology for rune scholars that has no chance of offending people over misunderstandings.