When my son was six, we were walking home from school one day and he told me about the playground game "Abandon Ship," where the boys all swarm the climbing-frame and pretend to be pirates, then they go on a run around the playground and capture some of the girls.
"I don't think it's a good game," he said. "The girls might not want to be captured. No one asks them. It's not fair on them. It's not a good game." He thinks about these things very deeply - he's what my awful mother would call "too sensitive" - and I love him for it.
His "friend" once roughly knocked him over, grabbed his arm, dug his fingers in, and physically dragged him along the playground, really hurting and upsetting him. The parents minimised it as "low-level boy stuff." If their daughter had been treated that way, I think they would have felt differently.
We have a lot of conversations about right, wrong, different, respect, consideration, and love.
I'm afraid he is going to be one of those men who can't find things when they're right in front of him, though, and I don't think anything I can do will change that. Sorry 