Crass grammar drives me crazy

I recently had a conversation with someone that went something like:

Me: Yeah, I went to the Sunflower market down on 287 & South Boulder Rd
PersonX: That's one long ass walk

How am I supposed to reply to that? I could say, "Not really, I wasn't ass walking the whole way" or "Yes, my ass is long, I should get in shape". No wonder people have such a hard time learning English...