Sucker at the Poker Table

Is it really true that there is one sucker at every poker table and if you don't see one it may be you?

If i dont see a sucker , probably the table is too tight..

Im really glad to not see a sucker for once

When you decided to go before the showdown in your thoughts, but made a fold for the player’s all-in from the right and threw out your winning hand in the end, from that moment you yourself signed the verdict of the loser. The first thought is always correct, and then there was simply a dialogue of the mind which is confusing.))