Ross County manager felt Hearts defender Igor Rossi might have been sent off during the Staggies' 2-1 defeat in Dingwall.
Rossi felled Jackson Irvine, allowing Liam Boyce to convert a penalty, but was only booked.
"He's definitely got the arms round him, hauled him to the deck," McIntyre told BBC Scotland.
"Whether that's a red card; I don't know how it works anymore, one is, one isn't, so that's a bit frustrating."
McIntyre's men fell behind to early goals from Osman Sow and Alim Ozturk, before Boyce's spot-kick brought them back into the game.
"I felt we gave away poor goals today; really disappointed with that, especially the second goal because we knew exactly what type of corners they do," continued McIntyre.
"But one of our players has switched off and we've been punished for that.
"I felt the two quick goals knocked the stuffing out of us, put a bit of doubt in our mind, and it took another 15 minutes of Hearts getting a lot of space, and it knocked our game plan off a wee bit.
"The players took a while to adjust, but credit to them, we got back in the game, we got the penalty incident which is a penalty, I've watched it."
Hearts head coachRobbie Neilson has guided the Edinburgh side to four wins from four since returning to the top flight.
"I thought at 2-0 we were really in command," he said. "We looked to go and score more, then we got the penalty decision against us and it totally changed the dynamic of the game.
"We ended up having to camp in and hit on the counter, but we can do that as well. I'm confident in the defenders and midfield we've got that we can do that for 90 minutes.
"The foreign guys coming in know how to manage a game - the younger Scottish boys are starting to pick that up as well, how to win a game.
"You don't always have to win it by playing wonderful football; at times you have to win it by managing it properly."