Jaylen Brown called the 2025-26 season his “favorite.” Taking into account that the Celtics were bounced from the first round of the playoffs — after blowing a 3-1 series lead — Stephen A. Smith believes this is a preposterous notion. The Boston star is not only sticking by his words, but calling out the ESPN talking head by telling him to hang up the microphone and “retire.” Brown claimed officials have an “agenda” against him on a livestream — for which he was later fined $50,000 by the NBA — after the Celtics’ elimination at the hands of the 76ers. On a stream Wednesday, Brown stood by his words. “I say this and I stand on this again. Clip this up. This was my favorite season of my career,” Brown added. “Like, I will say it even louder. I stand on it. I triple down, quadruple down, whatever y’all want me to say.” Brown clarified that it was his “favorite” because his teammates around him grew and had a largely successful season despite many pundits picking against the Celtics from the outset.…