Ironically I am not a fish purist - I have kept hybrid fish, and currently still have one in one of my tanks. The key words being - in MY tanks. I have a pair of fish that breed on a regular basis, one is a hybrid, they produce hundreds of fry on a monthly basis, but I leave the fry in a community tank and allow nature to take its course - they all eventually get eaten by the pairs tank mates. All good.
On the flip side I have been in this hobby many years, and have seen a LOT of people who buy a pretty fish that after several months of raising the fish discover that it is a hybrid, marketed, sold, traded, whatever, as something that it clearly isn't. (yellow lab?) Most of those folks feel cheated. I have also bred yellow labs for a number of years, direct descendants from a wild group that was collected by a friend while he was working at Lake Malawi.
https://www.monsterfishkeepers.com/...ht-labidochromis-caeruleus-lions-cove.701047/
I bred those fish and sold them to the LFS, and gave many away to hobbyists for free, in an attempt to increase the quality of yellow labs in this area. I currently still keep a breeding group of L. caeruleus "Ruarwe", a lesser known collection location that is not often seen in these parts. Having seen thousands of lower quality labs, or worse, obvious hybrid crosses, at various LFS over the years, I simply have no sympathy for anyone who knowingly supports passing along hybrids in this hobby, hybrids that when small are not always so easy to determine their lineage.
You obviously weren't sure what you had, hence the initial questions about this pair of yours. Seems to me you got your question answered, you just didn't like the answer. And no one is condemning anyone, just offering some sound advice.