In this answer https://physics.stackexchange.com/a/92833/36977 John said that acceleration is not relative in the general theory of relativity.
But as we all know, accelerating charges emit electromagnetic waves. So consider me and a charged body. Suppose acceleration is relative. Then if I accelerate, from my reference frame the charged body is accelerating, and thus would emit electromagnetic radiation. But if the charged body and I are both at rest and then start accelerating with the same acceleration $a$ in the same direction relative then, from my perspective it won't be accelerating since it's acceleration is the same as mine. But the charged body is accelerating. So it must emit radiation. But, as I understand it, that means I shouldn't see that radiation because from my perspective it is at rest.
Is there a contradiction here?