As I settle into my 40's I stopped tolerating:
Young cats playing their music loud out their phones. I was on the subway in NY and I literally gave this dusty youngin the deathstare, and 'I told to get some headphones or turn it off'
I stopped lending out money to friends and family for the most part, if you need 5 or 10, cool, but anymore than that and I gotta put it in writing that you gotta pay me back.
Negative people have no place in my life.