What this item shows that as in many sectors and in many "ways of life", newbees and ill-informed followers get in the way of the real information. Just as the New-Born Weight Watcher knows everything you didn't want to know about the right foods you need to slip into that fashionable pair of jeans, there are Newly-Religious folks who imagine they know more than the rabbis who have been studying the texts for a life time. What this item proves how little the writer knows about details of Halacha that pertains to fruits and vegetables. In some cases, growers start selling the fruit of trees that less than "four years" old. That fruit is forbidden. If, that was the reason the lemon was "not Kosher", I can understand why for the fuss. If not, . . . Nonetheless, he should have asked a rabbi why a fruit or a by-product of a fruit might be considered "not kosher" before rushing off to the word processor to complain of what he doesn't understand.
Firebomb thrown during demonstration in northern Israeli town of Umm al Fahm (Haaretz)
from the article: Is Passover really a festival of freedom?