How do you deal with this on a date especially a first date?
Use humor to bring awareness to the situation. You can tease him about it gently. Keep it light. A man of character will immediately become aware of what he is doing and make the necessary adjustments. Before you assume that he's simply a jerk, understand that many people use their devices because they're a little socially awkward or nervous. Give him a chance to redeem himself. You might be pleasantly surprised.