It's Called Sarcasm--Get It?

From Falling Waters:

In response to the Falling Waters person commenting on my comment about blinkers being an optional accessory: Of course it was a joke! My 7-year-old knows sarcasm when she hears it. I hope that no one in the Eastern Panhandle actually thinks that this comment was meant to be serious. My apologies if it was taken as such!

Did this person ever stop to consider that perhaps the responses were sarcastic as well?