This is just an example of differeces between decentralized and centralized exchange.
Everyone who decides to make transactions on the decentralized exchange should be aware of the risks - for "Newbies" the worst is not recognizing the basic addresses of coins / tokens (contract address).
Therefore, before anyone wants to trade on any exchanges, education is the most important thing.

Edit/ I don't want to say, that you did something wrong, but if i have to be honest, you didn't was careful enough.. Just saying..