I hope you’re ready for a deluge of ignorant comments. And some malicious ones.
I’m going quickly enumerate some of the more common responses.
“I knew a poly couple and they broke up!” -> we’ve all known many monogamous relationships that ended, too. Though it is true that going from a conventional, deeply entangled, monogamous relationship to something else is challenging. Read about the missing step if you’re interested. Monogamous people would also benefit.
“It’s bad for the kids!” -> the poly people I know who have kids, the kids are doing great. They have more adults in their lives that are invested in them.
“It’s just cheating!” -> cheating is when you break agreed upon rules. If the rules don’t include “only have sex with one person”, then it’s not cheating to do otherwise.
“It’s just about sex!” -> sometimes! Sometimes monogamous relationships are just about sex. Sometimes they’re not.
“I’m too jealous for that!” -> most people experience jealousy. What’s important is how you deal with it. If you’re the kind of person who has a freak out and breaks into your partner’s phone because he smiled at the waitress, that’s not ok and not something to be proud of. You can and should work on emotional regulation.
“You poly people think you’re better than everyone!” -> some people might. But that’s true for any subcategory of people. Vegans. Linux users. City dwellers. Country dwellers. I will say that living unexamined choices I think is the worse choice. If monogamy is something you really thought about and chose, fine, good for you. But if you’re just doing it because that’s expected and never gave it a thought? Less impressed. The same for eating meat or using windows.