How would I fix this script to make my pet say a specific phrase when I say a specific phrase?

Ok, so basically, I created a simple script which makes your pet chat when you chat, and it repeats what you say. The one problem is, I put in a couple key phrases, like "I'm dumb" or "I'm an idiot" where it would instead say "You think I don't know that?" instead of repeating the player, to add a bit of humor. The one problem is, when I say those key phrases, it still repeats the player. Why is this?

local chatservice = game:GetService("Chat")
local plrname = script.Parent.Parent.Name
local plr = game.Players:FindFirstChild(plrname)

plr.Chatted:Connect(function(msg)
	if msg == "I'm dumb" or msg == "I'm an idiot" or msg == "I'm stupid" or msg == "I'm an idot" then
		wait(1)
		chatservice:Chat(script.Parent, "You think I don't know that?", "White")
	else
		chatservice:Chat(script.Parent, msg, "White")	
	end
end)