Thou... Vain Bat-fowling Lewdster
Parts of what makes up this insult can be found in "Loves Labours Lost" spoken by "BIRON":

This insult has been seen 1 time on this site. This was on Friday, May 10th, 2019And train our intellects to vain delight.
Why, all delights are vain; but that most vain,
Which with pain purchased doth inherit pain:

A total of 10308 insults have been uniquely generated 10778 times, with a total of 125000 (or 50 to the third power) insults available in the system!