Bitcoin can not currently say bubbles because they have not actually broken. Even last month the bitcoin gets big and the price is high but now the bitcoin has not gone down until the value is zero so bitcoin can still go back up again.bitcoin can tell bubbles if bitcoin it will fast big and then broke in instant.
Ignore those who talk about bubbles. Bitcoin was a bubble back in the $400-$500 days, and it still is today. In other words, it's a continuous bubble that keeps growing larger and larger throughout the years.
Once we're about the break through the $50,000 mark, Bitcoin will again be a bubble, which is something that will never stop. People who don't understand why Bitcoin has value in the first place, will even say that $100 is a bubble.
I however find it quite funny that despite these people not valuing Bitcoin, they still find it necessary to talk about it regularly, like it's part of their job. If you don't like something, then just ignore it, it's that simple.
It however has to do with them having missed the early train, that I am sure of.