Roxanne Pallett confronted two boys on a train who 'harassed' her in front of her mum.
The former Emmerdale star, who played Jo Sugden from 2005 to 2009, filming the moment after the pair the had reportedly started ridiculing her within earshot.
It's not clear what was said exactly, but Roxanne was clearly upset as she says: "People are afraid to say hello so they talk about you not to you."
After the boys try to ignore her, one eventually says: "You've not been relevant for years anyway."
The 34-year-old was replied: "Really? Relevant enough for you to sit down next to me and talk about me, to me."
She then moved along the carriage to stand in front of them as they continued to exchange words, with other passengers remaining silent with their heads down.
Roxanne told the boys that every person was relevant, before one boy asks why she's filming him.
She says: "Because I'm documenting the harassment you've given to me since you sat down."
He denied the accusation, but a female passenger sitting across the aisle then backs the actress up.
Roxanne adds: "Yes you have, you've been harassing me to the point where my mum and I sat down, and you two proceeded to ridicule and harass me, make us move then you told me I hadn't been relevant for years."
The boy said he only said it because she was filming him, but she wasn't letting him off lightly.
"Last night I was at the Great Scot Awards celebrating people that made a difference," she continued.
"To me, every single person in life is relevant, so you need to educate yourself morally."
She warned them that calling someone 'irrelevant' can lead to mental health problems as the boy finally concedes he was in the wrong.
You can watch the video below.