In Florida, it is legal to use force (including deadly force) to prevent the imminent commission of a forcible felony. Here is the statutory definition of forcible felony (emphasis added):
“Forcible felony” means treason; murder; manslaughter; sexual battery; carjacking; home-invasion robbery; robbery; burglary; arson; kidnapping; aggravated assault; aggravated battery; aggravated stalking; aircraft piracy; unlawful throwing, placing, or discharging of a destructive device or bomb; and any other felony which involves the use or threat of physical force or violence against any individual.
Tampering with food is a first degree felony in Florida (ss 501.001):
Whoever, with reckless disregard for the risk that another person will be placed in danger of death or bodily injury, tampers with, or conspires or attempts to tamper with, any consumer product or the labeling of, or container for, any such product is guilty of a felony of the first degree
Why do I post this? Because there is a new social media trend where teens are filming themselves coughing on produce and then posting it to social media as a “corona virus challenge.” Doing this in the presence of any adult, armed or otherwise, should result in an immediate ass kicking, pepper spraying, or other use of force as appropriate to end the threat. Stupidity should be painful.