Neil Warnock voiced his frustration after a close game against Norwich City yielded no points for Boro.
Marcus Tavernier won a penalty kick but saw it ruled out for a double touch, then Teemu Pukki compounded the disappointment by converting one at the other end.
"The manner of it, it is difficult to take," Warnock said.
"We had to work really hard to lose that, I can't remember Marcus Bettinelli making a save.
"But penalties can win and lose you games. We missed ours and that's it."
Watch the interview in full above.