Old Friends coming out as polyamorous

I’m a social libertarian and don’t care what consenting adults do outside my home, but the question was about what we would want to accept IN our home. I’m not going to humor someone else’s stunted, immature sexual psychodramas by pretending that a “polyamorous” orientation is a real thing or that these are real relationships deserving of respect. To me, it’s the same thing as a 40 year old friend bringing over a an 18 year-old girlfriend and expecting me to take it seriously. It’s the same kind of self-absorbed, adolescent acting-out.