Little problems can suddenly become big problems.
It is so important to address things in the moment instead of brushing them off, waiting or saying nothing.
When you do this you’ll find that days, weeks or even months later you’re bringing stuff up that were (according to the other person) not an issue when they happened. And this can then make you seem disingenuous because you pretended that everything was okay instead of raising the issue in the moment.
I think it’s important to be clear about what you do and don’t accept. And then practice voicing that to the people around you so that they are aware of what you’re not okay with.
That way, you never have to let things pile up because that person is already aware. Sometimes we tell ourselves that by saying nothing we are avoiding confrontation or protecting the other persons feelings from getting hurt. However, more often than not we just end up causing ourselves more issues.