“All Lives Matter” clarification?

Hi everyone. I am a white female and I am having a hard time understanding why the phrase “All lives matter” is so awful to say especially coming from a white person? I am not a bad person just because I am white. I do not approve of the white supremacist groups out there. They are an embarrassment to all white people. I want all races to be respected and not killed. What happened to George Floyd was absolutely awful and shouldn’t happen to anyone. Please help me understand. I just want peace and no murder.
“All Lives Matter” clarification?
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