Strongly agree with Puglife. As long as you react to his behavior by doing what you think he wants you to do it will never stop. Don't cancel your plans. Remind him he is "joking" in a light voice/attitude if he becomes snarky. If he won't go for counseling with you, do find a good support for yourself! I have learned, you are unlikely in the future to regret what you have "done", more likely to regret those things "not done"...