First dates are usually a mixture of excitement, anxiety, hopes for the future, and the crushing feeling that no matter what you do, you're going to die alone without ever having met the mythical soulmate we all pine for deep down inside.
OK that might be a bit of an overstatement for some. Maybe you just thought someone was cool and wanted to get to know them better. Or maybe you want a free meal. Regardless, it's a new social interaction with a new person and that could lead to a lot of awkwardness.
So the last thing you need when you're on a first date is for someone to make it even more awkward, right?