LOL! It's one thing to wax poetically and use such words. I've used some where they fit and will continue to. But I do laugh when someone uses such words outside of that context. And I don't laugh demeaningly. I just laugh... because I enjoy seeing people try to manipulate perceptions of themselves.
How many times have you heard an American use "whilst" or "methinks" seriously in conversation, face to face? Or how about "milady, I dost require thine hand whilst I dost prance gaily through thine lily, methinks I dost"?
It's simply a humorous affectation, IMO.