So, just so you know, your guess is dead wrong. The user who posted that picture had this to say about it: "When I think of people working behind a garbage truck I think of men, that is my own prejudice but I think many people share that (look at this thread). So when I saw this picture the first thing I thought was oh nice they don't give a fuck about other peoples prejudices and just do what they want, more importantly CAN do what they want. This could very well be a bad example to you, but it speaks to me."
[0] https://www.reddit.com/r/pics/comments/3e1q3j/actual_feminis...