The Reds let yet another goal in the final 15 minutes of a match - the 15th time this season - to be held to a 1-1 draw at BMO Field despite dominating proceedings.
Cummins was irate after the match, saying his team should never have gotten themselves into that situation.
"It's as if you say to them, `Listen, why don't you score a goal and everybody drop off to the 18-yard box,'" said Cummins. "It's disgraceful. I'm not happy.
"We've dominated the game and given an awful goal away. I'm fuming.
"I'm screaming for 20 minutes about pushing up," Cummins said of the late stages.
"They're coming in (to the locker room) arguing with each other because they're saying, `Lads, why did we drop deep?'
"Well, without me going on the pitch and pushing them up myself, then I don't know."