Some of the most common pieces of FUD I see regurgitated over and over again are, in no particular order:

- The "imminent" quantum attack

- Inflation is necessary for muh economy

- BTC is for criminals (unlike banks, I guess?)

- Bitcoin boiling the oceans

- Bitcoin being "controlled" by whales

- Being too late to bitcoin

- Bitcoin is risky

- Self-custody is dangerous and hard, so keep all your stack on the exchange

- The imminent danger of a 51% attack due to miner (actually pool) centralization

That's just off the top of my head. I see a very, very strong Dunning Kruger effect in the tradfi community, especially.