I'd say:
"Hi! Nice to meet you! So, how are things?"
Then i'd keep asking you questions, and i would ask you why you hate cat obsessed people (As i am one of those Cat obsessed people XD)
Then i'd shake your hand
i dont hate cat obsessed people and i hontestly dont know why i said that. if i met you i wouldnt just walk away but i do know some people who are kinda annoying about it