You could face aggravated assault charges if you toss a tomato at a public speaker.
KRS 437.050 Attempting to interrupt or injure public speaker
Any person who interferes with any person addressing a public audience within this state, who interrupts such a person, while speaking, by the use of insulting or offensive language or opprobrious epithets applied to the speaker or who attempts to interrupt or injure the speaker by throwing missiles of any kind at him shall be fined not less than fifty ($50.00) nor more than five hundred dollars ($500), or imprisoned for not less than one (1) year nor more than six (6) months [sic], or both.
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