Because, why bother?
Step 1: Practice not caring about things that don't matter. Like, seriously, who cares? Start with your in-laws.
In-laws: The Original Unfazed Targets
Step 2: Develop a thick skin. Or better yet, a thick layer of apathy. Learn to ignore the haters and the critics.
Apathy: The Secret to Not Caring
Step 3: Focus on things that actually matter. Like your cat. Or your favorite snack food.
Prioritizing: The Art of Not Giving A F\*ck About Anything Else