Sort:  

Well, I'm not sure what you could say...but I'm going to say, "it's a good thing I checked because you spelled my username wrong so I wasn't alerted that you tagged me."

And here's a vote too.

Oh good gawd, I loathe and detest typing errors, in fact, my job used to include a lot of proofreading. I apologise and appreciate your diligence in tracking down my errant response. Perhaps I should procure some spectacles.

No worries, I keep an eye on it as I like that thank those people who take the time to say thank you. 🤓