Since the prompt is focused on personal experiences involved with language, I guess I'll answer with an experience of mine.
When I was around the age of nine in third grade, my teacher was a close-minded and cruel woman. (Not naming names). She always got on my nerves since the beginning of third grade year, but one day my teacher ridiculed one of my peers so disgustingly it made me rather furious and offended. I cannot remember what words she had said since this was five years ago, but I still remember the summary was ridiculing the kid for being mentally slow and that he was worth nothing in her class. So then I stopped class and stood up for the poor kid (since he was literally mentally slow), and told my teacher to give him more credit because he works hard to be at level with his peers.
I don't feel any different when I look back on that activism now, he deserved to be stood up for and given the credit he deserved for working so hard just to work with his peers.