Now retired, the 46-year-old anti-homophobia campaigner suffered abuse in the past, including being assaulted in 2016. He believes it is now more dangerous than ever for athletes, especially soccer players, to come out.
"Social media has allowed people to discriminate even more openly," he told The Guardian.
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"I don't see anything that's been done within football apart from token gestures. Nobody can say to me that if a footballer came out as gay tomorrow, they would be absolutely safe at every single ground they went to," said Thomas.
Gay sportspeople have a complex relationship with the fans and spectators, said Thomas."We want them to like us. We want them to cheer us. I can't imagine somebody putting themselves in the position of thinking: 'I'm going to be open about my sexuality but that means I will face an element of abuse every week.'"
"The only way you would change that is if you create a new environment in football. You could come out in business or the media and feel safe. In most forms of work, you could come out. But not in football."
Thomas in action for Wales in 2006.Getty/Mike Hewitt
At the grassroots level, the organization reported that 41% of fans had witnessed homophobic abuse on social media.
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"Things are said in a football stadium that would never be allowed on the street," said Thomas. "I understand football. If Swansea plays Cardiff, the home fans want to make it hostile for the away team. But we don't have to call people a faggot to create a hostile environment."
The legislation says it is an offense "to be abusive or insulting to a person by reason of his color, race, nationality (including citizenship) or ethnic or national origins." It does not cover abuse based on sexual orientation.
"I've had meeting after meeting," he said. "All I'm asking is to amend the act that was created to prevent racism because people are more likely to use homophobic language in a sporting stadium than racism now.
"I started this four years ago and it still hasn't been done. But I'll never give up."
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