He did one tap Kizaru though what else do you call hitting someone once and knocking them down for 5 - 10 minutes? We don't know if Kizaru is fine he's up but that's a huge jump to say he's fine when he was shaking on the ground unable to move when he first got hit.
Luffy is on the ground due to the draw back of his own powers. Imagine how much a character has to make you so insecure to hate him this much. Once Luffy is back up let's see if Kizaru starts running again.
Lol whatever you say keep inflating Lucci's strength just makes Luffy beating him easily all the more impressive.