Several black players opted not to wear the traditional pre-kickoff attire in protest against what they see as a lack of suitable action by the group.
Roberts was particularly vocal in giving his support to Danny Rose, who was sent off on England Under-21 duty this week after responding to racial slurs from the Serbian crowd by kicking the ball in their direction.
He said: "Jason had his view and it was very strong view. We spoke on Friday and I totally respect his view.
"It was important for him to do what he did today. I 100% back him."
Meanwhile, the result at Anfield leaves Reading in the Premier League relegation zone after seven fixtures.