When I was introduced to Bitcoin, I didn't believe in it either. I thought it was already suspiciously expensive (when the price was in the range of hundreds of dollars), and I didn't believe something purely digital could be considered real money and have real value. And that was years later than the guy in the tweet. It's understandable that it was a different time when it wasn't easy to believe in something so different from the rest of money and the rest of the asset market as well. What's important is to learn from mistakes. Both our own and those of others.
You know its funny for me at first when someone told me about bitcoin and I heard about it it sounded like a great opportunity. The second time I read about it and to me it looked like a scam. The 3rd time people were talking about it on the news and I was extremely intrigued. I am now wondering how the medium of learning affects perception because me hearing someone talk about it initially I was all for it. Reading about it from some dude on facebook in messenger linking an article in a group chat setting where he was ridiculed by others about it almost instantly also made me skeptical. But the last time in 2017 when I was hearing it on the news is when it finally stuck with me. Pretty much every since then I have been a student of Bitcoin.