The thing about this whole bad reference issue is a mute point, because who is going to bother writing a bad reference? It would serve only as a way for the person managing the former employee to explain why they didn't like that person's work ethic.
If you were then given said bad reference, would you really use it when looking for new work? Which is why you are more likely just going to get a piece of paper that says "Worked here from x to x.....".
Now that reference might actually be fine if you are just doing unskilled work, as it proves employment. However, if you've been working in an industry a while, it's going to be somewhat unusual if the only letter you can get from your former company is one that says you worked there for four years. It says a lot that there wasn't somebody there in a managerial position, who was willing to write a good character reference for you.
If you were then given said bad reference, would you really use it when looking for new work? Which is why you are more likely just going to get a piece of paper that says "Worked here from x to x.....".
Now that reference might actually be fine if you are just doing unskilled work, as it proves employment. However, if you've been working in an industry a while, it's going to be somewhat unusual if the only letter you can get from your former company is one that says you worked there for four years. It says a lot that there wasn't somebody there in a managerial position, who was willing to write a good character reference for you.