Why 75 F is a problem
Warm wine can taste alcoholic, flat, sweet, or heavy. A modest chill usually improves balance.

Serving Guide
The 75 rule for wine usually refers to avoiding wine service at room temperatures around 75 F. Most wines, including red wines, taste better cooler than that because heat can make alcohol, sweetness, and oak feel heavier.
Warm wine can taste alcoholic, flat, sweet, or heavy. A modest chill usually improves balance.
Serve most Pinotage slightly cool rather than warm. A 20-30 minute fridge chill is often enough for a bottle stored at room temperature.