Sounds like the perfect study for 23andme (they did a cilantro study [1]).

[1] https://blog.23andme.com/23andme-research/the-genetics-of-ci...

It probably is, or really just down to personal preference. Saccharin and Aspartame are awful to me, and I could never understand how anyone can touch it. Sucarlose I can handle it up to two packets. Three, and I get the same reaction as Saccharin. Stevia by itself isn't that great, either.

The only one I can use as anywhere close to a sugar substitute is Truvia, which is a Stevia/erythritol blend.

I believe so, yes.

My ex-wife used Stevia a lot and loved it. It tastes bitter and disgusting to me. Growing up, my mom always used Sweet-n-Low (saccharine sweetener) and tried to get me to use it. It always tasted bitter and disgusting to me.

I'm not a fan of grapefruit either (very bitter, no sweetness). Cilantro I'm okay with though; it doesn't taste like soap to me, but to some people it does.