Do people online matter?

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I feel so awful for what I accidently said to someone. In the World of Warcraft game there are two means of communicating with people. If you have someone on battle tag you can talk to them in or outside the game. Then when logged in the game you can talk to people in says or private message. So I login and my sister battle tag messaged me. She saw my character! Well, I had logged out when I got her message and popped back in. She had mentioned changing her character name because it made her think of a pasta dish. I didn't know the new name. I made the mistake to assume the character standing right next to me was her, since it was a C name and she said her new one had started with a C. The name was Cowlina or something like that, but I started making jokes about steaks and stuff. Like how is Cow-lina any better than a pasta dish? among other not nice things that I said in a joke to tease my sister. My sister battle tags me that I'm not talking to her... and I realize my mistake! I do apologize but they went offline before I could send the second part of my apology! I felt so bad. Then I was told by someone to not worry its just a random person and they don't mater. That doesn't make me feel any better. Do random people on the internet mater? should they mater? Maybe if they did, more people would be nicer overall. Instead, I think the internet often gives people the means to say harsh things they never would have the balls to say to people directly.