I certainly wouldn't go around bragging or referring to my son's penis in a sexual light. I'm sure it's intended humourously, but it's not a joke I'm personally comfortable with, nor something I want to think about!
However I think it's natural for some parents to perhaps worry. I'm basing this on the fact that I've noticed when a couple of my friends have changed their younger baby boys in front of me that they have had larger penises than my son. I would never say anything to them about it, or anybody I know for that matter, for I feel that would be betraying my son's privacy... I know he is only 11 months old but I wouldn't talk about my son's penis to people I know when he was older, so why would I now? But I did post a question, after that, on here, simply asking whether having a small penis as a baby in any way correlates to perhaps having a small penis later on in life (I know that might have been a naive question, but if you don't know you don't know!). I had a lot of responses, saying generally no it doesn't, and from a lot of parents who'd also had the same worry. For me, it isn't that I'm worried that my son won't have a big penis to impress the ladies or whatever, as I said that is something I absolutely don't want to think about! However I am aware that men with small penises often suffer with self esteem issues about it, and that's not something I would want my son to have to go through, so as weird as it sounds, I would prefer for him not to have a small penis when he is older, although I am sure it is never a conversation we'll have!
When I asked the question, I acknowledged that it was a strange thing to ask and said I hoped nobody thought I was weird, and explained the reason behind my concern. The responses from other parents were that I wasn't weird, and that it was a natural concern to have, as no parent likes the thought of their children suffering esteem issues.
But I certainly haven't mentioned it to anybody I know or anybody who knows my son, nor would I, I think that would be disrespectful to him and fairly inappropriate. I asked it on the internet to anonymous strangers who'll never be in a position to meet or judge me or my son!