Yes, it’s one of my standard things to do. I hate bullies. One non-fight/playground situation that comes up from time to time is when I stand up for fairness even when it doesn’t benefit me, and it’s interesting when some people actually criticize me or are baffled by my stand because it doesn’t represent my own issue. For example, pointing out that a test question was unfair or badly worded and others should not have been marked wrong for their answers, when I actually gave the answer the test wanted.
On the playground / school / neighborhood though, there were several times I fought or resisted bullies and won, e.g.:
About six “alpha kindergarteners” charged me and two of my friends saying “let’s get them and beat them up” and I punched one of the bigger ones in the stomach and he lost his wind and fell down, and the fight was over at that and they left us all alone after that.
Waiting to be picked up after school, a bunch of mean kids from the neighborhood came by looking to terrorize us. I had two of my friends and I hide in bushes over the sidewalk they were coming up and we jumped on top of them and knocked them down, and they ran away and didn’t come back.
In high school, a giant bully came lumbering menacingly at me and I drew a pencil quickly and pointed it at his stomach, and he stopped surprised and then laughed and left me alone.
Etc.
I’ve intervened as an adult, too. Once I was out walking at night and I went to see what an argument was about. A young man and pregnant woman were trying to disengage from a (more) drunk muscular boxer type with no shirt on, who was yelling at the guy that he “bounced a beer off his head” and owed him a beer. I went and stood at the side of them all to see what was going on and see what might be done. I thought maybe by giving an audience, it would fizzle out, but the drunk wasn’t giving up, and started looking for a rock, then went and tried to punch the guy (who was a lot smaller than him), and I took the moment to pound him on the side, but it didn’t do much to him and he gave me a look. I then stood in line with the other two, and when he wouldn’t back off and increased his threats that he was going to attack us, I started yelling “police! someone call the police!” and soon enough the police came and sorted it out. The officer who talked to me recommended I not get involved in future, but I think it was an obligatory politically correct line.
Also, pretty much daily I sign on to petitions and messages to Congress and/or corporations asking them to treat animals and wilderness well, etc. Kind of the same thing, to me.