I feel like the joke would’ve landed better if it said “first”. I know it’s pronounced the same way, but I’m gonna argue anyway that there’s a subtle difference. I’ve heard 0th used in cs to describe what was at the 0-index, so in that context 1st would be"second", but “first” generally means “nothing before it”. English is weird. I wonder if anyone knows whether the word “first” or “1st” came 1st (lol)?
I kind of brought this up in another comment, that “first” and “1st” aren’t really the same thing. Which is confusing when you extend that to fourth/4th five/5th. I don’t generally see someone write “zeroith”, but I’ll see “0th”.