The general rule of thumb is to keep ur debt/pre-taxincome ratio under 40%, not a made up number most banks do not loan to anyone with a DTI above that number.
$12000 monthly salary. You have $2000 rent/utilities + $1600 car payment is 30%. Even after tax income $7000 (probably more im not familiar with that level of withholding), thats 51% DTI. So you still have $3400 a month to live of after paying for rent/utilities and car. Thats not stretching thin by any means.
Obviously people can do whatever they want with their money, but blanket statements like "buying a car 2/3rds your salary is stupid" are incredibly misinformed.
I'm not sure where your $12,000 a month ($144,000 per year) example originated. In this case we know that the OP has income about 1/2 that.
So let's halve your numbers.
$6,000 a month salary. $1,000 rent/utilities (doesn't seem realistic AT ALL for Los Angeles but maybe he lives in a very low rent area or rents a room, etc.). $800 a month for a car payment. After tax income about $3500, so, per your example 51% DTI.
He now has $1700 a month to live off of after paying for rent utilities.
It does not seem realistic to me in a very high cost of living area like Los Angeles. As I already pointed out, rents/mortgage would be a whole lot more. Additionally leaves OP with little to no retirement investment which is a very bad financial decision.
As I said, everyone can do what they want, or what the bank agrees to in the case of getting highly leveraged with a car loan. I'm not here to tell people what to do, but if something looks financially disastrous I'm at least going to mention that there are other avenues.
We currently live in a culture in which being leveraged to the hilt is celebrated. The tail end of this are the 80 year old people you see working as greeters at Walmart or the 60-70 year olds who didn't plan ahead and are making coffee at Starbucks or working at McDonalds.
Free country do what you want... just don't ask me to bail your ass out from your short sightedness.... which unfortunately is what
does happen, starting with the construction of the social security scam, which allowed Americans to become even less responsible with their financial planning.