"Doing so would defeat the purpose of the one man tent that I purchased for this outing," he explained. "I undertook the prerequisite amount of research into this so-called camping expedition, and this item was highly recommended. Furthermore, there is a ten percent chance of precipitation expected in this region on Saturday evening, that I hope you anticipated and warned the other participants about."
This is Spock being informatively helpful. It's not him being smug. It simply is the Vulcan way of doing things: Everyone else is doing it wrong because it's not by the book.
Furthermore, he added (in what did sound slightly smug this time), "It appears that you are prone to taking on a more relaxed leadership role no matter if the location is here...or elsewhere."