Only Ginny Weasley knew how to speak for two seconds and completely irritate Ron on various levels of ego rupture. If he wasn't so naturally impulsive he'd acknowledge one day that she was obviously doing it on purpose. But... a man of the moment he was too blinded by immediate irritation.
Ron's chewing and pure enjoyment of his sandwich was lost at Ginny's misrepresentation of his job title, and her share of another sweater being knit for Hermione. Molly was certainly the type to knit his ex-girlfriend a sweater whether they were dating or not. The older woman tended to live on the opinion that Ron simply needed to pop the question. That he was the one in need of fixing. That thought alone ruined the 28 year old's appetite.
"I told her when we broke up, thirteen months ago," Ron answered obviously irritated. "She knows! I reminded her last week when she asked about taking Hermione to the ball! She's doing this on bloody purpose!" He tossed the sandwich next to the box of Boo Billygoat Tails. He then turned back to face his sister and made a point to add, "And for the record - I'm a Co-Owner here! I don't work for George! I've invested time and a substantial amount of money into this place! I create new product ideas, I box, I clean, I deal with the merchants, the fucking shitdick customers, I do just as much as anyone else!! Why won't you people acknowledge that I'm not some bloody slackjawed yokel sitting around waiting for a handout!!??!" His arms flailed in exasperation as he fell into a seating position on a nearby work stool. A particular look of expectation for Ginny to answer his semi-rhetorical question.