If a girl said fuck you on Facebook messenger and then blocked you, what would you do?

Like what if this girl ya know but don’t follow on Facebook messages you and says “huge fuck you to you” and you don’t necessarily know what you did or you don’t know if it’s an accident but I don’t do anything

I actually sent this to a guy and just wanted to know what he may be thinking
If a girl said fuck you on Facebook messenger and then blocked you, what would you do?
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