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.
That's how we regret what happened in the past... mistakes become valuable lessons for the future where we consider prices expensive at the time and see prices now that are too cheap...
We see that the price of $30K is already expensive sometimes even buying bitcoin is still with doubts, after a high surge in more than 1 year it was realized that bitcoin became a valuable asset than anything else... so now realize that digital currency is an important asset for us.