Of course he's always negative, looks negative, sounds negative. It's because he hasn't gotten over the fact that... not that he had a stroke, not that he didn't do any proper therapy for his arm and hand, not that god hasn't just healed him overnight, he's constantly angry he can't shovel food into his face as efficiently anymore. He has to wait for tammy to cut his food, wait for tammy to get his food, wait for tammy to hold the camera so he can eat on camera, wait for tammy to pour his sauce, wait for tammy to help with his shitty cooking show, wait for tammy to get groceries he may not necessarily want, and so on. We've seen him grocery shopping, he can't do it himself and tammy will tell him no on things. We see him attempt to cook all the time, and it takes him longer than it used to until he could put food into his face.
And that's all in addition to being the racist shithead, ignorant buffoon, etc. that he's always been. There's nothing he could be at this point except a perpetually angry old man.