MUP implies "multi-use" and what you see is what you get. Keep in mind that those folks you find so objectionable probably feel the same way about you, whether you get in their way, or blow them off with close high speed passing.

One thing that makes bicycling different from other forms of travel is the unusually broad speed spectrum. Most cars tend to drive at roughly the same speed on any given road, with a few being faster or slower. Pedestrians are the same way, walking a similar speeds. But cyclists ride at various speeds encompassing a wide range, so we're always passing and being passed. All that increases the amount of interactions, and thereby the potential for annoying each other.

That's life, and either get used to it, or live with frustration, because the world isn't going to change to suit your needs.