Crazy rules

Ok so what is with the double standard? Why is it ok for a friend, spouse, boss, whatever, be a jerk or mean and that's all fine and dandy, but if you have a bad day or month, or are going through something and maybe are not up to par in the humour department, then your a bad person? I have excused more than my fair share of friends poor behaviour over the past few years but feel the favour has not been reciprocated and why is that acceptable? I am done with people who are toxic, they are all history and never to return... anyone that has an ounce of poision - stay away~!