As can be imagined, Shakespearian insults are so much better than regular insults because a) they are clever and witty and b) people very often don’t know what you are talking about leaving you free to say pretty much anything.
• “I would challenge you to a battle of wits but I see you are unarmed.”
• “Take you me for a sponge?” (I suppose this is not really an insult but it is still a good line, Hamlet, act 4, scene 2).
• “I do desire we may be better strangers” (As you like it, Act 3, Scene 2)
• The next one is Benedick and Beatrice in an argument in Much Ado (my favourite play) from Act 1, Scene 1
Benedick: “Some gentleman or other shall ‘scape a predestinate scratched face.”
Beatrice: “Scratching could not make it worse an ’twere such a face as yours were.