Doc hasn't seen the ice cream parlor before, but it's certainly something. They don't have anything like this in Purgatory and he's only really had the ice cream that Waverly and Wynonna get. Though, Waverly's is vegan as opposed to Wynonna's.

"Never had rainbow sherbet, but I am used to the choices of the women I live with. But I am sure whatever you choose will be delightful." Doc wants to tip his hat, but as he continues to not have any hat, it is impossible. "A pleasure to make your acquaintance, miss. The name's John Henry, but you can call me Doc."