If you have to debate with someone about the "real" value of bitcoin. rather than people buying it to sell it for more fiat , what are the proper arguments that you have to use ?
The real value of Bitcoin is in its disruptive capabilities. It shows people that there's another way. That they don't have to be afraid that the government will freeze their account or that the fiat currency will lose value. They can keep their wealth in Bitcoin and be able to fit it all inside their pocket and send exchange it within minutes to a fiat currency of their choice. You have to live in an oppressive country like Venezuela to fully understand what Bitcoin gives you.
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I was trying to promote bitcoin to one of my friends, and he did not seem to be impressed at all, a while later another friend of ours talked about this new product that you can apply to your penis and get an instant 0.5 cm extra length and my friend got so excited and said he is going to buy it. 
The good old magic penis enlargement pill scam. Your friend is an idiot and most likely has a small dick, that's why he got so excited.