Should edits that only remove a "Hi" or "thanks" be rejected as too minor?

The [Edit Q&A][1] says, "Try to make the post substantively better when you edit, not just change a single character. Tiny, trivial edits are discouraged."  This doesn't really answer my question, but IMO removing just a greeting or closing doesn't make the post substantively better.  So if that's all an edit does, I usually reject it.

In http://meta.serverfault.com/questions/876/edit-powers-activate-removing-hi-thanks the consensus seems to be, yes, go ahead and edit to remove greetings and closings.  But that's not the same as asking me, as a reviewer, to approve those edits.  So how much discretion should I have to reject those edits anyway?


  [1]: http://serverfault.com/help/privileges/edit