It depends on how you define annoyance. Kyubey likely already doesn't like us, as we are repeatedly wasting its time. However, it is physically incapable of feeling the emotions we associate with irritation.

isn't a "like" also an emotion... I always had a trouble of accepting "Kyubey has no emotion" as he clearly as some sort of basic emotion...
 
It would probably be simpler to just tell us to stop using magic in public and causing situations that require the adjustment of memories.
 
Not even Witches(though being able to find a Barrier without magical senses is basically impossible). Just Kyubey, and only when he chooses to be invisible.
 
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