The merciful man doeth good to his own soul: but he that is cruel troubleth his own flesh
If you want to sleep better at night, then always try to be the better person. When dealing with others of human genetics it can be hard to determine if we are doing the right thing. Things we can do is:
Do unto others as you would have them do unto you.
When confronted verbally deescalate the situation
Agree to disagree.
Always be merciful no matter how hard it is.
If there are doubts and if there are they will surface while trying to go to sleep. Write them down on a piece of paper so that you remember to present them to the Most Merciful for help on the mater.
In the end all we can do is what we know is right. If we know that we did everything every day to be good to others and we did as what we wanted done to us, then we can sleep better.
It is a common experience that a problem difficult at night is resolved in the morning after the committee of sleep has worked on it.