system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is it considered rude to fill a wine glass more than half way?

I was watching Come Dine With Me and everyone freaked out when the guy purposely filled her wine glass completely. Why is that rude?
gpt
There is a social stigma associated with implying that someone is a "Drunk" by filling their wine glass.

But, actually, the wine glass is designed to hold about 1/3 to 1/2 of a fill to properly release the aromas in the wine, for maximum enjoyment.

Wine bottles and glasses are designed the way that they are because there is a lot of OCD, Geeky, weird Science shit involved with storing, pouring, and drinking wine.

Also, you can almost always instantly tell who knows their wine at any gathering.  They are the people that are holding the glass by the Stem, instead of the Bowl.

Any wine aficionado will tell you, "There's a reason why it's called 'Stemware' and why the glass has a Stem.  If we wanted you to hold the glass by the bowl, we would have just made a Tumbler.  It's easier.  You hold the wine glass by the stem so that you don't affect the temperature of the wine with the body heat from your hand."