It not so much that it "baffles the snot out of scientists;" more that it shows creationists have no grasp of biology.
Remember, it's creationists who use the term "kind" as the immutable barrier between creatures; changes within a "kind" happen all the time, but creatures can never become a new "kind".
Kind is just another word for common ancestry:
מִין mîyn, meen; from an unused root meaning to portion out; a sort, i.e. species:—kind. Compare H4480. Groups of living organisms belong in the same created "kind" if they have descended from the same ancestral gene pool. This does not preclude new species because this represents a partitioning of the original gene pool. Information is lost or conserved—not gained. A new species could arise when a population is isolated and inbreeding occurs. By this definition a new species is not a new "kind" but a further partitioning of an existing "kind".
Used of seed bearing plants, Gen. 1:11, 12; Birds, Gen. 1:21; land dwelling creature, Gen. 1:24; Animals wild and domestic, Gen. 1: 25…etc.
H4327
Which indicates exactly what Mendelian Genetics has been telling us for over a hundred years and Darwinism has been emphatically and categorically denying. That plants, birds, mammals and reptiles have limits beyond which they cannot evolve. This limit does not extend far beyond the level of genus, thus the word 'genus' is synonymous with origin. There is a reason this is in my signature:
“Gärtner, by the results of these transformation experiments, was led to oppose the opinion of those naturalists who dispute the stability of plant species and believe in a continuous evolution of vegetation. He perceives in the complete transformation of one species into another an indubitable proof that species are fixed with limits beyond which they cannot change.” (G. Mendel)
And then if you ask them to define the term, you are inevitably given the examples of cats and dogs and are either told "it's obvious" or "it's all the animals with a common ancestor." Either of which is begging the question, because whatever specific examples there are of transitions will always be met by "those are just the same kind anyway."
Start with larger taxonomic categories and bear in mind, they are highly subjective and pretty complex
Eukaryotic Kingdoms
CHROMISTA (Kelps, diatoms, haptophytes)
FUNGI (Fungi),
METAZOA (Animals)
PLANTAE (Plants)
PROTISTA (Protists)
Metazoan Phyla (the animals)
Cnidaria (corals, jellyfish, Hydra)
Conulariida
Ctenophora (comb jellies)
DEUTEROSTOMIA (deuterostomes)
---Echinodermata (starfish, sea urchins, sea cucumbers, etc.)
---Hemichordata (acorn worms, graptolites)
---Chordata
Cephalochordata (lancelets)
Myxini (hagfish)
Urochordata (tunicates, sea squirts)
VERTEBRATA (Vertebrates)
ECDYSOZOA (molting animals)
---Arthropoda (crabs, spiders, insects, etc.)
Anomalocarida
Cheliceramorpha (chelicerates & kin)
Crustaceamorpha (crustaceans)
Pycnogonida (sea spiders)
Trilobita (trilobites)
Uniramia (insects & kin) ---Cephaloryncha (kinorhynchs & priapulids)
---Nematoda (roundworms)
---Nematomorpha (horsehair worms)
---Onychophora (velvet worms)
---Tardigrada (water bears)
LOPHOTROCHOZOA (worms, molluscs, & lophophorates)
---Annelida (segmented worms)
---Brachiopoda (lamp shells)
---Bryozoa ("moss animals")
---Echiura (spoon worms)
---Entoprocta
---Mollusca (snails, clams, squid, etc.)
---Nemertini (ribbon worms)
---Phoronida (horseshoe worms)
---Pogonophora (bearded tube worms)
---Sipuncula (peanut worms)
Placozoa (the most simple animals known)
Platyhelminthes (flatworms)
Porifera (sponges)
Rotifera (rotifers) & Acanthocephala
Vendian Animals (the First animals)
Then it’s the vertebrates, mammals and when you get to the genus level you are talking about the level of kind since the words appear to have identical meanings. Unless you would like to define taxonomic categories, which I highly doubt, since evolutionists are not obliged to define anything. They just correct anyone who doesn't agree with then whether they are right, wrong or just of another opinion.
It's an empty claim; it doesn't really mean anything. Why that would suit you just fine, if you were honest and cared about the truth, I have no idea.
Right back at you, I just love how evolutionists, aka Darwinians, like to feign some melodramatic indignation. It usually means they have ran out of substantive things to say and are preforming for others. Since most creationists are too polite to call them on it and evolutionists never contradict other evolutionists they just step up center stage and dramatize for all they are worth.
The problem is the theater is now empty and the performance echoes into an empty array of dusty chairs.
Have a nice day

Mark