Can i get in trouble with a lawyer for this?

I worked with this person in a business (doesnt matter the business) -dont want to give any info that could hint to the person.. its nothing illegal.. lol but he screwed me over and used me and never called me. So theres this page against his family business.. like a boycott. and i commented that he is a scum and he screwed me over!!! and he texted me that i will be hearing from his lawyer and i'm digging myself in a grave