"We can confirm a local 16-year-old boy was dealt with by way of Restorative justice following the incident at around 9pm.
"Restorative justice was at the request of Mr Thomas and accepted by the teenager who admitted assault and was apologetic for his actions."
In his video, Thomas, who announced publicly in 2009 that he is gay, said: "This morning I have decided to make what I hope will be a positive video. Last night I was the victim in my home city of a hate crime for my sexuality.
"Why do I want to be positive? Because I want to say thank you to the police, who were involved and were very helpful and allowed me to do restorative justice with the people who did this because I thought they could learn more that way than any other way.
"Also to the people of Cardiff who supported me and helped me because there's a lot of people out there who want to hurt us but unfortunately for them, there are a lot more people. So this, I hope, will be a positive message."