IRISH actor Daryl McCormack was warned by his family to expect racial abuse after he was selected as one of the poster boys of the referendum campaign.
It emerged that the 20-year-old was subject to vile and racist taunts by internet users.
Officials at the Referendum Commission, which is an independent body, removed the posts and blocked the culprits.
Daryl's uncle, Gary McCormack, said last night he had been prepared for racial abuse.
"It's upset us, of course it has, but we're able for it," he added.
"Daryl will stand up against it. I've spoken to him and he hasn't even read the comments and he has no intention of doing so. He's not thinking about it, it's like water off a duck's back."
Head of the Dublin-based Integration Centre, Killian Forde, described the culprits as "racists" and "foolish".