Sec. 42.07. HARASSMENT. (a) A person commits an offense if, with intent to harass, annoy, alarm, abuse, torment, or embarrass another, the person:
(1) initiates communication and in the course of the communication makes a comment, request, suggestion, or proposal that is obscene;
(2) threatens, in a manner reasonably likely to alarm the person receiving the threat, to inflict bodily injury on the person or to commit a felony against the person, a member of the person’s family or household, or the person’s property;
The harm is harassment with a threat to cause bodily harm, here, making the person nauseous with an unknown (to the subject) substance, and potentially a threat of even worse to come.
Vinegar, salt, and lemon juice isn’t harmful. Neither is flour, yet put it in an envelope and mail it to a Congress critter and you have a threat of bodily harm. What matters is at the time the threat was made or received was it reasonable to perceive it as a threat. This part is open to interpretation. It could be the bully gaming the system in their favor, but it could also be reasonable for a bully to interpret it as “today it’s salt and vinegar. Tomorrow rat poison.”
I get it. I have no sympathy for the bully, and every for the bully’s victim. I did similar to my middle school bullies: ex-lax brownies and oyster sauce in bottled Pepsi. I did it to the lunch thief at work. But that doesn’t make it right or legal.