"When we're not giving our all, I think that's the most deserved boos," Kristaps Porziņģis said after Friday's loss to the Kings.

The reality is nobody fears the Celtics anymore. Opposing know they can win at the Garden, and are throwing various defenses to which Boston's offense can’t consistently respond.

A competitive game Friday night turned ugly late for the Celtics, who were run off their home floor by the short-handed Sacramento Kings. The Kings, who were playing without injured leading scorer De’Aaron Fox,

Despite the expectations placed on the NBA's reigning champions, the current campaign has delivered the latest step in the Celtics' maturation in a humbling fashion.

The Celtics are now just 3-5 in their last eight home games, which is more losses than they had at home all of last season.

Domantas Sabonis collects 23 points and a career-high 28 rebounds, leading Sacramento to its sixth straight win, 114-97.

The Sacramento Kings entered Friday night’s matchup against the Boston Celtics amid a five-game winning streak, but they knew they would have a tough test against the defending champions. Instead, the Kings dominated the Celtics, defeating them 114-97, pushing their winning streak to six games.

Sacramento Kings guard Malik Monk (0) drives to the basket against the Boston Celtics in the first quarter at TD Garden. Mandatory Credit: David Butler II-Imagn Images / David Butler II-Imagn ...

Domantas Sabonis had 23 points and a career-high 28 rebounds and the Sacramento Kings used a fourth quarter rally to beat the Boston Celtics 114-97.

DeMar DeRozan added 24 points and nine assists, and Malik Monk finished with 22 points and eight assists. Boston has lost two of its last three. Jaylen Brown led the Celtics with 28 points ...

Domantas Sabonis had 23 points and a career-high 28 rebounds, and the Kings used a fourth-quarter rally to beat the Celtics 114-97.

The Sacramento Kings were widely criticized for firing Mike Brown as head coach but Malik Monk's recent comments might indicate they made the right call. After the Kings blew out the Golden State Warriors 129-99 without De'Aaron Fox on Sunday,