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United were demolished at the Gtech Community Stadium and they're currently bottom of the Premier League after losing their opening two Premier League games.
Ronaldo started the game after coming off the bench against Brighton, but he cut a frustrated figure throughout and failed to have an impact.
The 37-year-old was marshalled well by Brentford's backline and was limited to potshots outside the penalty area for the most part.
His afternoon was summed up by Bees wing-back Aaron Hickey showing no fear and clattering into the five-time Ballon d'Or winner.
Ronaldo's future has been a hot topic all summer and he's keen to leave Old Trafford for a second time.
Supporters have reacted to his showing and they think his time in the first-team could be up.
One person said: "If any football youngsters watch this, they will forget the whole sport."
Another put: "He could actually be finished now."
A third commented: "This is humiliating."
While someone tweeted: "A small part of me thinks he's shooting from those areas on purpose to annoy Ten Hag. Like a 'if you won't let me leave' type thing."
Ronaldo allegedly refused to clap the United away support at full-time and instead headed straight down the tunnel.
United assistant coach Steve McClaren exchanged words with the Portugal international, who also didn't shake hands with manager Erik ten Hag.
Reports emerged on Sunday claiming United were considering terminating Ronaldo's contract if his attitude didn't improve.
These claims have since been called false by the club and they expect Ronaldo to fulfil the final year of his contract.
According to The Athletic, Ronaldo sits alone at United's Carrington training base and regularly 'flaps' his arms in training.
He's also said to be arguing against the high press ten Hag wants his players to adopt in attack.