Is it okay to ignore this?

[Lucy]

My ex and I broke up. He's saying things about me on social media. I've ignored it, mainly because I saw him in person and he acted like a coward. So I know he won't say anything to me in person, but he won't stop with the crap talking on social media. My mom is pretty bad and wanted me to do something, but I see no point. I only care because I don't want my name to be ruined, he had the guts to say my name on his posts