Anybody from the real world have just one issue as described do horrible damage to their reports.
Honest question...can see a reduction of score but to damage it badly?
One 30 day late on consumer credit (revolving accounts like a credit card) are not a big deal. On installment credit (car payment, etc...) it's frowned on a little more, but still not that big of a deal. You start missing mortgage payments, even one, the stakes increase tremendously.
Of course, it all depends on how much credit you have. If you've got 5 credit cards and only one has a 30 day late, not a big deal, you've shown you can budget because the other 4 are paid on time just fine. If, however, you've only got one credit card, then that's different.
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