The Republic of Ireland players were booed as they took the knee as their game against Hungary kicked off.
Stephen Kenny's men played out a 0-0 draw against the Hungarians in Budapest on Tuesday night.
As the referee blew the whistle to get things under way, the Ireland players took the knee in support of the anti-racism movement in football.
However, the Hungarians stayed standing, pointing the Uefa's "Respect" badge on their sleeves, while the home fans booed.
An estimated 10,000 fans packed into the Frenc Szusza Stadium, but they made their feelings heard by strongly booing the Irish players for taking the stance that they did.
Speaking after the game, manager Stephen Kenny described the incident as "incomprehensible" and "disappointing".
He said: "The fact it was booed was incomprehensible really.
"It must be damaging for Hungary with the Euros in Hungary.
"It's disappointing and it doesn't reflect well on Hungary and the Hungarian support."
The FAI re-shared the clip and said: "Proud of this team and proud of our values."
