Is It Okay To Block Inactive Users?

Twitter is so weird. A friend of mine blocked me, knowing it was my alter account, so if they had something to say and I wasn't there, they could have directly messaged me on the main.. but they just blocked me straight.

Is blocking for such ways justified?

Updates
+1 y
They never blocked me. They clarified just now they just deactivated.
Is It Okay To Block Inactive Users?
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