The main clause is positive, so the reversed polarity tag is negative: Kenny is rarely late for his appointments, isn’t he ? This asks for confirmation of what is said in the main clause. The positive tag is also possible, but it would suggest surprise, disbelief, etc.
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Aspara GusThe main clause is positive, so the reversed polarity tag is negative: Kenny is rarely late for his appointments, isn’t he?For me, the word 'rarely' has such a negative idea, that I would use the positive tag: