The reaction of your friends reminds me of when straight people only know one gay couple, and they can sort of become weirdly overly-protective and overly-supportive of said relationship in their enthusiasm for feeling like they're good allies, like they're such good, upstanding, open-minded people for having this gay couple in their life.
Me, 30ish bi female, been doing solo poly for roughly 5 years. Gia, Clay, and Pike, my partners. Davis, ex/friend/"it's complicated." Eric, Gia's husband. Bee, Gia and Eric's toddler.