Bitcoin is not going to following the disappointed trend of such previous bubbles. It is a different phenomenon on its own. Bitcoin is money, and as such there will always be an increasing demand for it.
It is not the money in the usual understanding of this word. Bitcoin is an asset. Naturally, BTC cannot be called a bubble as this cryptocurrency managed to prove everybody - it will survive and live long.
For sure it is not bubble id you explore the world most used source of earning so you will get to know that bitcoin investment is running at the top these days. People are spreading such bad news only to reduce the number of investors and they have planned to buy huge amount but after making the market fall down. So dont listen to them keep buying and keep holding.