I know this might sound silly, but how do you do it? Avoiding the awkward silences or blank expressions on people's faces as they don't know what the hell you're going on about etc.
I've never thought about it - it would be like asking me how I remember to breathe in and out.
Giving it some consideration, here's an example:
Me - Alright mate, you coming to lunch?
Person X - Nah, I'm trying to be healthy and bringing my own
Me - [I don't care] How come, you look in decent enough shape?
Person X - Well I've been getting into this new fasting craze where you eat controlled portions ever X days and starve for the others?
Me - [I don't care] Ha, not sure I could manage that - after 24 hours I'd be clamming, don't you find the hunger pangs screw your concentration when you're in deep work time?
Person X - It can do I guess, but what I'll usually do is just hammer down the water to stave it off and keep me on track
etc etc etc until the conversation either reaches a natural conclusion or a third party interruption prematurely ends the talk.
Or how about from the opposite perspective
Me - Anyone know anything about Zen gardening?
Person Y - Zen gardening, WFT is that?
Me - Haven't you ever seen those miniature gravel gardens where everything is laid out in patterns etc etc
Person Y - Dude you are into some well weird stuff. So where does it come from?
Me - I first saw it in a book in 1989 and I just really fancied getting into it
etc etc etc as above.
Isn't this normal basic social interaction that most humans are pretty much coded with from birth? I didn't really know people had to actively think about it, short sightedness on my part I guess.