Twitter user claims they've put me on Doxbin.

Hi, I made a harmless post on "X" about how empathetic society is today and for some reason, a celebrity fanpage account has replied to me and told that they've put me on Doxbin. This is because I blocked their alternative account because they insulted me, unprovoked. As online as I have been for the past decade and a half, I have never heard of this site until today. Should I be nervous? What does this mean from me?

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