Stereotypes, clichés, put-downs, prejudices
You are invited to submit the sort of anti-Polyamory comments you've heard or read. You may also submit your own replies to same. I'll start with 2 examples:
"You're just too immature to handle a REAL relationship!"
My heart's just too big to be limited to petty, stingy love."If you spread your love too widely, it's never deep anywhere."
If you take a thimbleful, or a litre... or a square kilometre of water from the ocean, is the ocean noticeably shallower?