Former Leeds coach Poyet, who was making his first return to Elland Road, said: "They celebrated the goal like they were going up. I don't know why.
"They came over to us past the fourth official and celebrated in front of us. I don't have a problem with anyone at Leeds. It was a special day and I have seen so many friends but I think they are under pressure. They are really feeling it.
"I feel sad for them because that reaction was from people who don't understand the game. I said a month ago that this is the year for Leeds. I was convinced, but after seeing their reaction I am not sure.
"I think they were complaining that we were wasting time but did I tell the players to waste time? No. Were we cheating? No. I promise you, we did nothing."