[Content Note: Disenfranchisement.]
There are people who are actually disenfranchised from voting in this country. Those people are disproportionately Black, poor, disabled, immigrants, trans, and/or people who have been or are currently incarcerated.
Not understanding how closed primaries work or not knowing when cutoffs for registration are is not disenfranchisement.
And while there are absolutely legitimate arguments for reforming the primary system in a number of different ways, arguing that the Democratic Party should be more accommodating of your desire to destroy the Democratic Party is not one of them.