Bring a large pot of water to a boil. Cook macaroni according to package instructions. Drain and rinse with cold water.
While the macaroni is cooking, prepare dressing. Combine the mayo, vinegar, pickle juice, spicy mustard, agave, red pepper flakes, garlic salt and pepper in a bowl. Stir to combine. Taste and adjust seasoning.
Add the macaroni, dressing and chopped veggies to a large bowl. Toss to combine and place in the fridge for an hour to let the flavors marinate.
Serve with more chopped parsley, pepper and/or red pepper flakes.
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Notes
If you are someone who likes a heavily dressed macaroni salad, just double the dressing recipe. It's all about personal taste!