Subjective Dilation-Time

For two observers, in two moving referential frames at different speeds, each one sees a time dilation different from the other time dilation (or time-dilation symmetry). But these are clearly subjective time dilations, not an objective time dilation. These symmetric time dilations cannot be simultaneously done in practice; it is absurd. The proponents of the Theory of Relativity assert that the so-called black hole is so powerful, that even the time itself is brought to a stop. But this looks very much as science fiction, since the objective time goes on anyway.