If it is white wine, you hold the stem, but if it is red it is okay to hold it by the globe. This is because your body heat will warm the fluid in the glass and white wine tastes best when it is chilled, where red wine, depending on the variety, tastes better when a bit warmer than chilled. For instance, Shiraz tastes best a room temperature 68°F and Merlot or Burgundy tastes best at cooler than room temp. 60°F-65°F. Champagnes should never be served warmer than 63°F, but they taste best at 58°F. Then there are liqueurs like Brandy that must be warmed to near body temp. This is why only a small amount is poured into a large snifter and it is held by the globe in the palm with the stem through the fingers and swirled to encourage the liquid to warm from the contact of the hand on the glass. So, hold white wines and champagnes by the stem of the glass and reds by stem or globe depending on variety.
That is today's lesson in wine etiquette. The more you know!
I've read this like 3 times but this the first time i've noticed the way he was holding the wine glass Σ(  ̄□ ̄||)
http://www.mangago.zone/read-manga/daikirai_na_aitsu/mh/v01/c002/33/