It's impossible to be "good" (or bad, nice, etc.) objectively, because objectivity would require everyone to agree on that. "X is good" is not a proposition in

It's impossible to be "good" (or bad, nice, etc.) objectively, because objectivity would require everyone to agree on that. "X is good" is not a proposition in logic, so it can't be confirmed or negated. However, you can choose a more objective formulation of what you want to achieve. One way is to express it in relation to what others do, e.g. "I won a marathon" - this is a proposition and an objective fact.