Obi-Wan simply nodded his head at the sort-of compliment, then frowned at the next thing Kylo had to say.
"Oh, well, I'm sure that's supposed to be incredibly impressive," he replied, clearly anything but impressed. No doubt a senseless loss of countless millions of souls, passing into the Force all at once. He'd experienced enough of that during Order 66. "What was their supposed crime? Free thinking? Daring to want to remain apart from the First Order?"