Luffy will never be called slayer of shit lmao. If zoro kills kaido then I would give him the title but I don’t think any straw hat is killing the main villain until Blackbeard’s arc where the straw hats are forced to kill them
First, Kidd's chances to kill off a yonko in this arc are right now so little we will probably reach a technological singularity in real life before this comes to fruition.
Second, it was purely a joke to infer that he is not achieving what Luffy and Zoro are probably meant for, independently from the consequential epithets that may or not be bestowed upon.
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(Should I explain to Luke that slay also means overcome and not necessarily kill or did he have enough?)