EDIT: Thanks for all these answers, but I'm really wondering if there was ever a case of a black slave owning an Irish slave. I really have my doubts about this one, but someone made that assertion in another subreddit.
This is what another redditor said.
"The Irish slaves were often the slaves of the black slaves, so go figure."
A link to this was posted in /r/irishhistory and anyone who wishes to discuss it in an irish context is welcome.
Our perspective is different. No disrespect, but colonial methods were evolving as were slavery laws as colonists liked a bit of law to legitimise their practices.
Context is very important to what is being discussed.
History major here with a possibly relevant fact to explain just how low the opinion was of Irish immigrants: Irish men were often given the jobs that slave owners did not want to risk their valuable slaves on. They were essentially lower than slaves. The time frame goes up until the abolition of slavery.
Edit: I went full derp on original time frame. TIL not to post until I'm awake and to remember which time frame I'm trying to convey when I've got Colonial through the 1980s swirling in my overworked brain.
Sources: America's Women by Gail Collins and Coming to America by Roger Daniels