I always love when people resort to the "you don't understand" the science, the data, the whatever. Proves only that you can't make an argument yourself. And citing others' work without quoting it is just as disingenuous.
Easy to call names. Easier still not to post anything that disproves what was said, and this ...
... is opinion, not proof.
This, on the other hand, is proof of what was said. Take, for example, dating of a piece of wood. The tree absorbs carbon from the atmosphere in the form of carbon dioxide, both C-12 and C-14, as long as it lives. With the death of the tree, absorption obviously stops, and any C-14 present begins to decay. The changing ratio of C-12 to C-14 indicates the length of time since the tree stopped absorbing carbon, i.e., the time of its death.
The half-life of C-14 is 5,730 years. If half the C-14 decays in that period of time, we know that's how old the wood sample, or perhaps the petrified sample, is at the time of testing. By ten half-lives (57,300 years) there would be essentially no C-14 left. Thus, no one even considers using carbon dating for dates in this range. That isn't enough C-14 to measure. In fact, it is difficult to measure beyond one half-life, because C-14 is so rare compared to C-13. In theory, it might be useful to archaeology, but not to geology or paleontology.
Furthermore, the assumptions on which it is based and the conditions which must be satisfied are questionable. It is doubtful, for example, that C-14 occurs in uniform proportion to C-12, and in practice, no one trusts it beyond about 3,000 or 4,000 years, and then only if or when it can be checked by some historical means.
The method assumes, among other things, that the earth's age exceeds the time it would take for C-14 production to be in equilibrium with C-14 decay. Since it would only take less than 50,000 years to reach equilibrium from a world with no C-14 at the start, this always seemed like a good assumption.
Until, that is, careful measurements revealed a significant disequalibrium. The production rate still exceeds decay by 30%. All the present C-14 would accumulate, at present rates of production and build up, in less than 30,000 years! Thus the earth's atmosphere couldn't be any older than this. Efforts to salvage carbon dating are many and varied, with calibration curves attempting to bring the C-14 "dates" in line with historical dates, but these produce predictably unreliable results.
Those are just a few of the problems with carbon dating, and other methods of radiometric dating rely on much rarer isotopes with much longer half-lives. The longer the half-life, the more difficult it is to get an accurate measurement of actual amounts of the radioactive isotope relative to the stable atom of the element, and again scientists run up against the proportional distribution of the isotope, depending up nature to have evenly distributed with the stable version of the element.
In other words, to quote you, "It's [all] crap."