How do you shout out long names?

I've recently started to notice that whenever people with very long names follow, i tend to panic trying to say thanks. For long names followed by a number (for example dustyfeather46) i usually joke that there were a lot of other idiots with the same name and he had to choose that number (for example: 46 cause there were 45 idiots before you?). I had people getting angry cause i misspelled or shortened their nickname, pls help👉👈