If you don’t have anything nice to say, don’t say anything at all.
I am still working on this one. I have made immense strides these past several years. As with everything, though, it is a work in progress. My newest goal in it is tied to the idea of this not being purely audible things that I say. Dwelling on the angry and/or rude thoughts in my head does not improve the situation, does it? While it does not hurt the person in my immediate speech, do those thoughts not remain somewhere within me, and affect me whenever I interact with the person? And also when the person comes up in conversation with others? Will my disturbance remain only within me? Perhaps, and perhaps not. Whatever the case, I dislike being stuck with the upset thoughts anyway, and so aim to rid myself of them altogether. If I don’t have anything nice to think, don’t think anything at all. That is a space for meditation, after all, and meditation has only ever done good in my world.