Really the only thing that got me mad was him/her taking the time to look me up on the internet.
Sadly, in this day and age, there are some real nutjobs out there who will not only look people up, but find them in real life and cause harm. As retribution over a silly internet argument. This is why I think it's a bad idea to give out personal info on a public internet forum. I know some folks here think it's bad manners to use a generic username, but I've seen some real horror stories of people who freely gave out their real names (or phone numbers, physical addresses, etc.) on the internet. Ya gotta be careful out there!