What does the snail joke mean in training day?

First of all, this is an open question. It may have many meanings. But according to the plot, snails should refer to people who yearn for this line sadly. The popular explanation may be a little dark: no matter how hard some people try to climb into this industry, they are just snails being kicked around. People who kick snails don't care. -ethan hawke, the young policeman in the plot, is like a snail. His fate was to be kicked out by police officer Allonzot and then stubbornly climbed back. Other characters can also be understood as snails, such as the old man who tells jokes. His relationship with Allonzot is complicated, and Allonzot just uses him as a tool. Old people are like snails. Everyone in the film is always a little sick and a little snail.