I think that's underthinking the issue. It's not just about individual court cases, it's about the dramatic and rapid influence that corporations exert on human-to-human language use. Emoji designs are for-profit investments made by corporations and they are not like normal language.

Corporations are making these emoji and people are using them to communicate. The meanings are ambiguous, never taught in school, tied to profit motives of domestic or foreign corporations, and liable to change at a moment's notice without all parties receiving the same change. It's a mess for future of society and communication, and that it's showing up in court cases with confusion already is a leading indicator that the problems will get worse.

It could still raise the question of whether the sender knew how their emoji would be rendered on the receivers screen. Did the sender know that their water gun would get rendered as a real gun, causing the receiver to feel threatened, or did they assume it would also be a water gun to the receiver, giving off a playful vibe.