I don't know why you had to over-exaggerate your laughter on a subject like this. Sure it's funny to think of reproducing, I guess. Intercourse, was that the joke? Most 20 to early 30 year old males who say what you did are afraid to lose the freedom that they've obtained. Which is understandable. To lose the ability to do as you please at whatever time they wish, to not be tied down; yeah, it can be sort of scary. "I can barely take care of myself let alone a child", is the usually route they go down.
Why bring a child into this twisted world, right? As a man, YOU NEVER CHOOSE between "furthering your DNA", or "nice things", because it's not something you alone decide on. Nice things are nice things--tomorrow there will be nicer things and next week too. They get old eventually. I urge you to think about this.
Kids are awesome. Way more entertaining than a fully modified Subaru Wrx or the newest game console. I'm not saying you're wrong in thinking this way, but to laugh about something others might find meaningful and rewarding, something they are probably going through right now just seems really childish. No one is ever ready for a child which is why many are afraid of it because it's not something that can be taught. I encourage you to look at this differently, to look at it as not just a simple "no", though you probably won't, but it'll make you seem less like a child if this convo ever pops up in a discussion within your many social circles.