Aberdeen boss Derek McInnes told BBC Scotland he was "bitterly disappointed" with his team's home performances.
""There was no shortage of effort but there was a lack of aggression, a lack of confidence and a lack of responsibility, because we had enough chances to win the game despite losing two goals," he said.
"Clearly we expect far more of ourselves and I can only apologize to the supporters for the level of performance. We have to make sure we are competitive all of the time, not just in some of the games.
"The more aggressive team won the game,the team that looked as if the points were more important to them."