This article is an attempt to present one of the vital features of modern culture, namely indifference to truth. In the context of proclaiming the expression “post-truth” the Word of the Year 2016, the author shows how this modern indifference should be understood. It is explained by recalling the essay of Harry G. Frankfurt entitled On Bullshit. This short text presents a certain characteristic trait of modern times, that is, a certain attitude to truth typical of the contemporary man. What is interesting is that it is convergent with the meaning of the very expression that has recently made such a spectacular career and became the Word of the Year. In the first part of the article the author presents the history of the term “post-truth”, its basic meaning and the context in which it was created and is now used. The term “bullshit” is then treated in a similar way. In the third part of the article the main thoughts of Frankfurt’s essay are referred to. It is pointed out that this short essay, written already in the 1980s, proves to be still valid up until today. For in his essay Frankfurt does not describe any political reality, social or medial one, saturated with dishonesty, disinformation, lies and manipulation. He does not attempt to present various types of examples of “bullshit”. Instead, as befits a philosopher, he goes deeper and attempts to reach the essence of this phenomenon. In this way he draws an unusually accurate image of the modern man for whom truth has lost its significance, for whom there has grown between truth and lies – contrary to any logic – a whole sphere of bullshit, or otherwise post-truth. In the fourth part of the article the author points out the sources of such a situation. He talks about the rejection of the realistic, classical way of understanding truth and, in relation to it, about turning away from reality, that is from facts. In the last part the author explains that in modern times in place of reality (as an important point of reference) the criterion of coherence and democratic consensus has been introduced, or – what fits well into the culture of “bullshit” – the criterion of practicality and usefulness. Instead of thinking in terms of objective order, it is therefore proposed that one should think and act in terms of subjectively perceived advantages. At this point the author refers to Richard Rorty’s philosophical conception and shows that Rorty’s end of philosophy, the abandonment of the search for the ultimate foundations of cognition, for the discovery of truth, for the dominant idea of „contingency” and usefulness, and his „language games” are all excellent illustrations of what a man of the era of post-truth, the era of indifference to truth, nourishes.