I addressed it here:
To summarise:
- Discrepancies and discordances are the exception, not the rule.
- Showing that one method fails under specific conditions does not prove that all methods fail everywhere.
- Showing that a method fails when pushed to its limits does not prove that all methods fail everywhere.
- Discrepancies of a factor of two or three do not prove that all methods must be out by a factor of a million or more.
- The differences are unsurprising, well understood, and useful.
- Some claims of discordant dates are blatantly dishonest.
In short, the extent and significance of discrepancies and discordances is blown up out of all proportion by YECs. You need to look at all the radiometric data as a whole, not just a few cherry-picked examples. When you do so, you see that they fall far, far short of justifying claims that all radiometric results could consistently be out by a factor of a million or more.