Hello 
Is this sentence correct?
A: He mocked at my fears.
Does the word mock require a preposition? I think mock is a transitive verb but I’m not completely sure.
Thanks
“mock” is transitive so you don’t need “at”. To me personally, “mock at” doesn’t sound quite right – like a confusion with other constructions such as “laugh at”, “smile at”, etc. However, at least one dictionary I’ve just checked allows “mock at”, and Google shows reasonable usage of that form. I guess different people may have different opinions on this.