I'm just sayin'.
Today, nearly all English speakers drop g's sometimes, but in a given speech community, the proportion varies systematically depending on formality, social class, sex, and other variables as well.
For instance, in a 1969 study done in New York City, Bill Labov found that in casual conversation, g-dropping varied with social class as follows:
Lower class Working class Lower middle class Upper middle class Percentage of g-dropping 80% 49% 32% 5%
In other words, as class status "rises," percentage of g-dropping falls.
However, formality also matters: members of a given social stratum drop g's more often in less formal speech. Thus for the lower class members:
Casual speech Careful speech Reading Percentage of g-dropping 80 53 22
Oh, and Dusty (& Martha & The Vandellas):