Time to make your feelings heard Jalen Brunson is leaving the Dallas Mavericks to join the New York Knicks. This is decided, only the contract cannot be signed until Thursday at 5 pm CST. With that in mind, we want to take the temprature of the fanbase and see who you are most frustrated with. Call it “blame” if you want, but seeing as we fans have no say in the process, we should still voice our frustrations. Welcome to SB Nation Reacts, a survey of fans across the NBA. Each week we ask questions of the most plugged-in Dallas…