I don't quite get the drama.
Maybe someone can explain the inappropriateness perceivable in this scenario,
because I don't see it.
A allows B in group. No problem.
A checks profile of B. No problem.
B choses to set A to ignore. Also not a problem because everybody's individual choice.
Now A wishes to kick B out of the group again? I fail to see anything else but a desire for retaliation, quid pro quo and all that.
But I may be missing a logical reason. Hence my inquiry.