The video, which first emerged on July 24, was reportedly taken in Switzerland, where the presenter is spending her summer vacation.
Many on social media are outraged at the fact that Namdari is seen drinking in the video, given that alcohol is prohibited in Islam.
However, it remains unclear whether she was drinking alcoholic or alcohol-free beer.
Namdari is being labelled a "hypocrite" for taking off her hijab while outside of Iran - a country where it is the law for women to wear it.
The labeling highlights the fact that she is a well-known proponent of the country's strict Islamic dress code.
"This time wearing a hijab, she explained she was sitting with family members and 'maharem' - close relatives among whom a woman does not need to wear a hijab - in a park," BBC wrote.
She added that "her scarf fell suddenly and the video was taken at that instant by an unknown person."
In her response, Namdari made no mention of the beer she was seen drinking.
Backlash on social media
Soon after the video went viral on social media, thousands took to the hashtag #Azadeh_Namdari in response.
Even after Namdari responded to the controversy, people continued to attack her on social media, claiming her response was unconvincing.
However, a few defended the TV presenter, saying it's her personal freedom to do whatever she sees fit.