If someone is using negative superlatives in your general direction, such as (the worst, never does blank, always does that) it probably means that there is some truth to the statement. Now would be a good time to self-investigate for character flaws, and then make changes.
If you are using negative superlatives towards somebody else (literally the worst, dumbest, always, etc) it is likely that you are telling yourself an untrue story. Now would be a good time to ask yourself what other superlative stories you might be telling yourself, and then make changes.