Just pick up a comment under his status of ppl he did not block and leave a reply, you can also mention him easily, the only difference is he will not be able to see it but that is beyond a point, public should know.
~~~ embed:1238824062325067776 twitter metadata:YXNjaGF0cmlhNzc3fHxodHRwczovL3R3aXR0ZXIuY29tL2FzY2hhdHJpYTc3Ny9zdGF0dXMvMTIzODgyNDA2MjMyNTA2Nzc3Nnw= ~~~
I'm thinking he will start blocking everyone haha