As an American adult that is uncut and was also semi bullied back in the day, don't do it. Let your son decide when it's his decision to make. Now that I'm in my late twenties I'm glad that I never had it done people generally stop caring as we get older. Eventually the benefits start to outweigh the downsides and most of the downsides are just social and not physical. If anything the physical benefits are amazing. Makes it all extremely more sensitive and makes naughty times way more fun. Something like 3/4 of the nerve endings die in the tip on circumcised men. And when it comes to partners it all comes down to preference, which is always a factor regardless of what your junk looks like. My last girlfriend thought it was fun and really enjoyed it, but I've also met someone that didn't like it because he had a bad experience once.

There are two major reasons why people find it gross. One can be fixed and the other is just unnecessary stigma. The most important advice I'd give is about hygiene. Too many men neglect it and have to learn the hard way that you actually have to clean underneath, that's where most people get turned off by it. The other reason people are grossed out by it is because they've never seen it before because it's so uncommon. I say be the change you wanna see in the world. Circumcision is slowly falling out of fashion because we are all slowly starting to realise it's pretty dumb and kind of brutal to do to a kid.

And if it comes to it, it's a lot easier to remove one than get one back. Let them make the choice.