Images of two of the boys police want to speak to in connection with the offence have been released amid an appeal for the information.
One of the pair is seen wearing a patterned shirt while carrying what appears to be a bottle of alcohol, while the other is pictured wearing a dark CP Company t-shirt and light blue face mask.
The verbal abuse took place at around 2.15pm on Tuesday, June 8.
The man who the group aimed the abuse at is aged in his early 30s, a Metropolitan Police spokesperson said.
They added: “There have been no arrests, but as a result of enquiries, officers would like to speak to the two people shown in the CCTV images.”
Officers from the Met’s East Area Basic Command Unit are investigating the offence.
It is the latest homophobic abuse offence in the capital, following a recent police appeal for information after a man was attacked in Worcester Park earlier this month.
The victim recalls homophobic comments being made before he was punched hard in the face.
Speaking last week, Acting Detective Sergeant Herdeep Jugdev, from Bromley CID, said: “This was an extremely violent attack which left the victim with head and facial injuries for which he is still receiving hospital treatment.
“It also appears that the assault was motivated by the victim’s sexuality. Hate crime of whatever kind is something we will never tolerate and we are doing all we can to find the person or people responsible.”
Any witnesses or anyone with any information is asked to call police on 101 or contact via Twitter @MetCC. Please quote reference CAD 4641/08Jun. To give information anonymously contact Crimestoppers on 0800 555 111.