I'm thinking "anti-capitalist" attitude is usually a result of the poor decisions in early adulthood (decisions regarding education, reproduction, career, social circles). When these choices don't pay off, failure to recognize that and self-correct early enough builds resentment. Since the system doesn't reward poor decisions (works as designed) it's very common to shift the blame from yourself (your incapability to adjust, adapt, improvise, and overcome) onto the system and characterize it as "exploitative"