While hanging out with Starlight Glimmer, Eric Reed blurted out that he thought Rarity is a large ham, due to her habit of being overdramatic. As per his luck, Rarity happened to be in earshot and did not like what her human friend called her, albeit for reasons Eric didn't mean.
However, even if Eric tried explaining what he really meant by "large ham", Rarity might not take that answer well either.
This story is one of a still-growing series of stories that all take place after A Giant Adventure to Equestria. However, it is not necessary to read any of them to understand this story, but "A Giant Adventure to Equestria" does show the details of how and why the human OC Eric Reed is in Equestria even if the story isn't that great by my standards and improved writing abilities now.
If you enjoy this story and would be interested to check any of the other stories with Eric, you can find the list of all current ones here.