Read my comments further down. Your party affiliation is whatever you decide it is. There are plenty of reasons to register, vote, or support candidates contrary to party affiliation. That doesn’t make you ‘not party X’ unless you decide you are no longer supporting party X. It seems pretty simple to me.
It is definitely bullshit, but your employer isn’t a winner here either, they’re also paying out $600 a month for your $1200/month health insurance.
The real problem here is why the fuck does health insurance cost as much as housing in this country?