A 96th-minute penalty converted by Jean-Philippe Mateta earned Palace the point on the day.
An angry Iraola told the Daily Echo afterward: “I suppose for the neutrals watching it must have been entertaining because there have happened a lot of things in the game.
“I think we've been better in the first half, but they've been clearly better in the second half and you could feel that the draw was coming because they were pushing us a lot in that moment.
“But I'm not happy and not pleased because to receive the call of penalty we received, I cannot be pleased in the 96th minute.
“It's very difficult to win in this stadium. They are a very good team. But to lose the two points the way we've lost it, I cannot be happy. I'm upset and I'm angry.”