The left back was involved in a battle with Greg Halford all game and felt that referee Mark Brown unfairly penalised him for holding as the Millers winger backed into him before going down.
And the Bees captain accused the referee of being influenced by the home fans who appealed for everything. Indeed, the match official told Lee Frecklington he was 'happy' the Millers grabbed the winner after his mistake in awarding Brentford a penalty.
Bidwell said: “It's a game of football, not a game of basketball. Playing against a player who six foot five (Halford) and I can't get hold of him, how am I supposed to deal with it?
“You've got to find a way of dealing with it. I don't think I was doing much wrong. I think he was playing off the crowd.
“They were making a noise and he was making his decisions through the crowd. At the end of the day, we've had chances to equalise and not taken them.”
Any hope that the Bees had turned a corner after the win over Wolves in midweek were dashed as Matt Derbyshire and Danny Ward's goals were enough for Rotherham with the Bees scoring from Alan Judge's wrongly-awarded penalty.
Bidwell added: “I think we've shown what we're capable of in the week and it's producing the performance after performance, especially when you come to places like when all they want to do is play like a rugby team.
“We've got to stand up to that and be good enough to put our stamp on the game and play the way we want to play.
“They used the players they've got and, at the end of the day, it's worked for them as they've won the game.
“I don't think that's the way we want to play but we've got to be big enough and good enough to impose our game on teams that want to play like that.”
Bidwell made his 200 appearance for Brentford but the landmark meant little to the full back after the loss.
“It's a nice landmark to get to but, on a day like today, it doesn't really matter,” he added.
“It's disappointing to lose the game. Set pieces cost us. There were bouncing balls in the box and they got to it first and we had chances to equalise and didn't take them.”