They do not know My transcendental nature as the Supreme Lord of all that exists. The Bhagavad Gita chapter 9, verse 11. These words were spoken by Krishna, to His cousin Arjuna, on the battlefield of Kurukshetra. As great sages have explained, if Krishna can be derided, then His devotees can be, too.
Foolishness is surely a bottomless pit, into which fools can sink indefinitely.
The evidence is that fools are even capable of deriding Krishna when He very mercifully appears in His deity form, as well. Having said that, I now present the words of a few fools for the amusement and entertainment of Krishna's devotees.