MetaEd has the gist of it. It is customary to frown upon gratuitous rudeness, dishonesty, and flame-warring within english.stackexchange.com, as evidenced by the Be Nice section of the FAQ.
I understand that you felt offended by the comment. I know Matt quite well—he is a long-standing member here—I can assure you that he meant no insult to you.
If you see a comment that you believe to be rude or offensive, the appropriate action is to raise a flag to bring it to the attention of the moderators. A rude/offensive flag will put the comment in the flag queue for 10K+ users to review as well, and if enough of them agree with you, the comment will be auto-deleted without moderator intervention.
If you are not satisfied with the decision made by the community regarding a rude/offensive flag on a comment, posting on Meta is always an option. However it is best to do so in as neutral a way as possible because no matter how justified you are, the community often perceives this particular type of Meta question as pitching a fit. That is because either 1. it is obviously rude and needs no further explanation, so just flag it, or 2. it is not obviously rude and the flagger is perceived as being overly sensitive.