Horses and Grasses Puns

This is the exact interaction that took place:

Dad: I have a joke for you

Me: Aight.

Dad: When someone expresses an annoying opinion ask them...

Me: Go on. Im enthralled.

Dad: Deer eat grass, cows eat grass

Dad: Horses eat grass

Dad: Ask: why is deer poop like raisins but cow poop look like paddies and horse look like apple plop

Dad: He or she will say I do not know

Dad: R u ready for punchline?

Me: I was born ready.

Dad: Ok then...

Dad: U say, why do I care what u say when you don't know shit!

Me: I see you learned to text message.