Asparagus Pasta Salad with Italian Dressing

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Dressing:

1/3 cup red wine vinegar

2 teaspoons fresh lemon juice

1 1/2 teaspoons minced garlic

1 teaspoon sugar

2 teaspoons dried oregano

1/2 teaspoon crushed red pepper flakes, or more to taste (optional)

1/2 cup extra-virgin olive oil

Pasta Salad:

Kosher salt

2 1/2 cups dried short pasta, such as penne or rotini

1 pound asparagus, tough stems removed, spears cut into 1-inch lengths

2/3 cup sliced red onions

1 1/2 cups diced tomatoes

2/3 cup grated Parmesan, for serving