United States of America fullback DeAndre Yedlin claimed Neymar was play acting when he won a free-kick during the friendly victory by Brazil and asked the referee if he had seen what went on at the World Cup.
Firmino put the visitors ahead after 11 minutes when he tapped a volley home from close range after fine work on the right wing from Douglas Costa.
Just 32,469 attended the match at MetLife Stadium, a possible site of the 2026 World Cup final, and Brazilian supporters vastly outnumbered American fans.
In its first match since a quarterfinal loss to Belgium at the World Cup, Brazil improved to 18-1 against the US - with 11 straight wins since a 1-0 defeat in the 1998 CONCACAF Gold Cup.
Although the award looked generous, Neymar made no mistake, sending the goalkeeper the wrong way to make it 2-0.
"In the first half we didn't defend, press as a team", center back John Brooks said. The Americans were missing their top player, 19-year-old midfielder Christian Pulisic, who has an unspecified muscle injury.
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They also said he is better positioned than nearly anyone else in the party to raise huge amounts of campaign cash. And the other comments Obama made at a Democratic rally in California didn't appear to impress Pirro either.
The Brazilian goalkeeper Alisson Becker appeared to have little to do and managed to save a goal at 72 minutes by United States midfielder Wil Trapp, what was perhaps the US' best chance in the match.
Brazil maintained its strong tradition with an easy win on Friday, thanks to the goals by forwards Roberto Firmino at the 11th minute and Neymar converting a penalty at the 43rd.
He said: "I thought our coordination of trying to step out wasn't very good in the first half, we got pulled apart a bit; I thought the second half was an improvement".
Neymar converted a penalty kick after the questionable call by Mexican referee Fernando Guerrero, the fourth official for USA loss at Trinidad and Tobago last October that eliminated the Americans in World Cup.
Neymar, who now plays for France's PSG, converted the penalty with a soft shot to the left as Steffen lunged to the right.
As one small example of Brazil's strength and range of options (see team below), Everton's £40m+ signing Richarlison made his first global appearance last night.