The MLS expansion franchise lost their first game at JELD-WEN Field this season when DC edged them 3-2 and the former Chelsea striker said it was a poor performance by his side who had won their previous five games at the venue.
"We got what we thoroughly deserved, which is zero points," Spencer said.
"DC United said they wanted to silence the crowd and be the first team to win at JELD-WEN. They did one of those two things. They never silenced the crowd, but they won the game. So they backed up their talk."
And Spencer added that the Timbers had been lucky in recent outings but on this occasion were outclassed.
"We started sloppy in the Philly game and got away with it," Spencer said. "We started sloppy against Columbus and got away with it. Today we got punished.
"(United) were sharper, they were hungrier to get on the ball, they passed better than us," Spencer said. "Do I think they're a better team than us? No. But today they were."