It's like bathrooms. Public restrooms... with the stalls. People make assumptions.
If you want me to hear and understand what you are trying to communicate, I can't be making eye contact. If you're trying to communicate technical information that I need to process and respond to, I can't even be looking in the same direction as you. I never understood why people say that eye contact shows people you're listening. Like all I'm going to hear when making eye contact is every fiber of my being screaming at me to look somewhere else...