The expression "low-hanging fruit" does not mean the same thing as "strange fruit." If someone used the phrase "strange fruit," I could see why it would be offensive. But "low-hanging fruit" just means it is easy to obtain or utilize. https://dictionary.cambridge.org/dictionary/english/low-hanging-fruit

That said, I am quitting using common sayings that have clear origins in the practice of slavery, such as "no skin off my back, " or "sold down the river."