I'm not sure how anyone could honestly support the filibuster. It's extremely undemocratic and has mostly been used to prevent civil rights legislation and keep racism enshrined in law in the US. It wasn't even an intended mechanism of law in the constitution - it was introduced by accident, and only "discovered" as a mechanism to delay government action decades later.

You're equating using the levers of power as defined by our laws and constitution to trying to overthrow the results of an election. And you'll find far more Republican supporters of overthrowing a duly elected government than you'll find Democrats who want to end the filibuster. We have real evidence based on numbers that indicate this. You can't "both sides" your way out of attempting to overthrow democracy.