If you want to oppose policies for being regressive, then you should be calling for our many regressive tax expenditures to end or be made less regressive. These include 529 plans, 401(k) and IRA accounts, FSAs, HSAs, and the mortgage interest deduction.
Policy initiatives billed as benefiting the middle class that largely cut taxes for the wealthy:
HSAs
FSAs
529s
mortgage interest deduction
401(k)s and IRAs, especially (but not only) Roths
I benefit from many of these, and believe they should all be abolished or transformed.