In this thread, most of the responses equate to: can't sing = don't like. In other words, a technical capability (whether a person can sing or not) is being reduced to a personal preference (whether someone likes a singer's voice or not).
This is not surprising, because a performance is more than an demonstration of technical proficiency, and in most cases, it is the performance that resonates with a listener, rather than vocal quality. Two good examples often used are Bob Dylan and Tom Waits. Both have vocal techniques that would be likely to appall a vocal coach, but both have a legion of fans who hang off every drawled, nasally, or croaked word.
Beauty, here, is in the ear of the beholder, and being able to sing or not (in a technical way) is largely irrelevant.
However, if you are embarking on a musical career, it is risky to justify a lack of vocal proficiency on the (spurious) basis that "99.99999%" of singers can't sing (therefore you don't need to be able to either). You may be able to get away with it if you can deliver a convincing performance, but being able to sing in tune and on time is likely to win you more fans earlier.