
First of all, it would be Polyamory not Polygamy. Polygamy is having multiple marriage partners and is usually based around religious aspects. Polyamory is having consenting intimate relationships with multiple partners.
Second of all, saying "no shade" and then having "ew" as your subject and telling people to "stay away from you" as if they'd give you cooties is clearly being nasty and throwing shade. You can like monogamous relationships without being rude about it.
If you are actually curious about polyamory why don't you look up YouTube videos or something with an open mind and listen to people who are Poly explain why they choose that lifestyle.

No problem! Technically Polygamy can involve any gender, but is usually Polygyny (one man + multiple wives) and Polyandry (one woman + multiple husbands). Polygamy is illegal in most places while Polyamory isn't.
Polyamory can have a variety of relationship types with all genders. For example, 3 people could all love each other, or a married couple can individually have boyfriends/girlfriends, one person with multiple partners etc.
Polyamory is based highly on consent since it involves multiple people. The other people in the relationship have to agree with boundaries set in place and if those boundaries are crossed then it's considered cheating. Like 1. Telling your partner you are going on a date with your boyfriend and they say cool have fun = not cheating 2. Lying about going on a date with your boyfriend because your partner might dislike the bf even though you are Poly = cheating.
A lot of people want to see more poly stories because 1. Very rare. Most romance stories are monogamous and we aren't shown other relationship types in media which can make people think only monogamy is acceptable. 2. People like all the romances in the story and just wish they all could work out and be happy together. Which I think is generally a lovely sentiment. 3. A lot of romance stories will have Love Triangles and I think a lot of people are tired of it tbh and people will be like "ughh I want to see something where they aren't just fighting over her and one guy is clearly the one she ends up with. I rather they just all end up together and not fight about it"
My next life as a Villainous: All Routes Lead to Doom! I believe is a polyamorous relationship. I don't think she ever chooses one person and the group is all pretty happy and has men and women.
The novel Iron Widow by Xiran Jay Zhao also has a polyamorous throuple in it.

I really don’t care, like I don’t want to talk with people who are into it. I can pretend to be nice irl to people like that, and I won’t talk bad about it irl, but I absolutely want to have nothing to do with them. I really don’t care about what anybody who defends it thinks of me. You can think I'm close minded.like I don’t really want to argue with others, but this is my bottom line.

Bro then why even ask.
Not much different than someone being like "oh the gays can do what they like, but I think they are disgusting and they better not exist near me". Come off it.
I'm not saying you are close minded like that's an opinion. You straight up ARE close minded. God forbid you listen and try to understand experiences outside of your own that literally don't affect you in any way. You didn't even know the difference between Polygamy and Polyamory so what do you even know about it? Get off the high horse.
I rather know someone in a healthy poly relationship than a person who cheats in a monogamous one.
Why do you all like polygamy so much, I can’t stand it. No shade to people who practice it, but you all need to stay away from me.