You can still confirm to your boy that yes you ARE a tree-hugging hippy, but it doesn't mean you don't know anything.

Reminds me of my poor sds - he was about 8 when he seemed upset about something his mum said. "mum says you are a witch" - Really? I say......"well you know that its true though don't you?" Big wide eyes - "well don't I fix you when you aren't well, didn't we make those nightmares go away, didn't I teach you how to dream?" Nods. So mummy was right, I've got all sorts of tricks up my sleeve don't I? Nods. "Now pass me that broomstick please, I have to get to the shops" sds cracks up and skips away...

NOW - if ds ends up liking the hitting target side of things (which I am sure is the only thing he might get out of it), you can always introduce him to Archery - which is purely about skill and imho a rather "noble" type of sport....