But we are reacting to society. Hence, clone versions of you living 100 years ago, in current times, and 100 years in the future are going to react differently because there are different inputs and different accepted outputs to their behavior. They all are going to have different assumptions about the world around them because they live in worlds with different sets of knowledge. Schooling would be different (I'm assuming things continue to improve/change over time in the future). Nutrition, healthcare, transportation, communication... all has changed so much.
And this is the same when comparing current times. Three clones of you might act similarly in some respects, but vastly different in others. We've studied this exact thing by studying identical twins, actually, and even growing up in the same country doesn't even out the differences.
At the end of the day, it does mean that even though genes might affect the way we act, the comment you are replying to is absolutely correct.