Ex is being nasty. Why?

My ex dumped me 3 months ago in a cold way...
I decided to move on and then he tried to initiate a conversation but I cut it right away and wished him the best of luck.

Now he is posting nasty things about my country and nationality (we are from. diff countries) ... he doesn't know anybody else from here except me... so I guess he is trying to hurt me, wtf.
Ex is being nasty. Why?
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