That is to say, Yahoo is viewed as non-innovative, and their action is viewed to be the result of a new CEO intent on aggressively finding pennies through any means including just by lawsuit. Meanwhile, most of Yahoo's team is apparently against this action.
So, it's the context. If you drop the context and equate Apple to Yahoo, then it's easier to arrive at: why is everybody upset when a company files a patent lawsuit.
I bet the same people upset about Yahoo also find Apple's lawsuits to be distasteful. Apple is viewed as a very innovative company, so they're given slack when it comes to suing over issues related to innovation.