It's not taking it too seriously as more that it's just frustrating to have to explain something over and over again to -blam!-ing idiots. When you get frustrated it's natural to take a more serious tone. For instance, he just explained why matchmade raids won't work, and then you say just to "fill your fireteam with your friends," as though that solves the problem. It doesn't solve the problem. The solutions to problems don't always involve making everyone happy. This is one of those cases.