"Solo soy un tipo malo que cobra por joder a tipos peores."

Simplified Meaning:

This quote describes a person who sees themselves as not very good but still better than the really bad people they deal with. They get their money by doing something to stop these worse people, even though their own actions might not be completely right either. Imagine a person working as a bounty hunter. They may not follow all the rules, use rough methods, and aren't seen as a hero by everyone. But their job is to catch dangerous criminals who are causing harm. While the bounty hunter might use force and break some minor laws, they stop truly terrible people from doing more damage. So, this person thinks of themselves as somewhat tough or mean but knows they are still preventing much worse things from happening. You can apply this idea by understanding that sometimes people do hard or unpleasant jobs to keep even worse things from happening, and not everyone doing good work looks like a traditional hero.