Usher is said to have been disappointed that it (”Here I Stand”) sold 433,000 in its first week, compared with his last CD, 2004’s “Confessions,” which had sales of 1.1 million in its first seven days. “Usher was livid!,” claims an insider. “He threatened to fire everyone.”“People have been telling Usher to listen to his mother,” says a source. “Nobody knows how to sell him better than she does. Usher can be stubborn. But he may be ready.”Some claim Usher pink-slipped his mom because she failed to show proper deference to his stylist-turned-girlfriend-turned-wife, Tameka Foster. But now that Foster has given her a grandson, the two ladies are said to be getting along better. Usher, for one, denies he fired his mom. Rather, he tells Vibe, “[I paid her] the ultimate compliment – to retire her to be a full-time grandmother.”Patton has actually been busy running her own record label and managing other artists, including Usher’s brother, Jlack. But sources say that if Usher cries momma, she’s there for him.