How to approach my male friends about hitting on me inappropriately?

I’m afraid to speak up because last time I tried to assert boundaries nicely, men thought I was accusing them of sexual harassment and they complained to the boss and I got fired from my job. With these men telling everyone I’m a sexual predator and turning friends against me. I’m afraid that I might get similar drama from merely standing up for myself. Can someone please help me?

How to approach my male friends about hitting on me inappropriately?
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