My point is that you are misusing the term "worst" (which is the superlative form of the word "bad").
If you want to say some hands lose to other hands. You are absolutely correct. If you said that some hands had a "lower value" than other hands that you are completely right.
The whole point of poker (whether you are bluffing or calling or raising with the nuts) is to win money. In this context whats bad is losing money. Clearly, the term "worst" is most appropriate for losing a whole lot of money.
When the loser holds a full house... he is generally going to lose a whole bunch of money (and yes, I have been there).
Getting a low value hand isn't so bad.