The more fool him/her/you &c!

[Theseus]

The more fool you!
Something that you say in order to show that you think someone has done something stupid:-
--You lent her sixty pounds and expected it back? More fool you!
-- 'He's volunteered to work late.' 'The more fool him, then.' :down:

 

[Cadmian]

Καλά να πάθεις, κακό του κεφαλιού σου/ κακό δικό σου are perhaps the nicest way to put it.

A more colourful interpretation would be τα θέλει (κι εσένα) ο κώλος σου.

 

[nickel]

Άλλο:
Τόσο ζωντόβολο είσαι / είναι!

 

[Palavra]

Or, καλό κορόιδο είσαι κι εσύ/καλό κορόιδο είναι κι αυτός.

 

[Cadmian]

And, of course, καλός μαλάκας είσαι/ είναι (κι εσύ/κι αυτός/και του λόγου σου/και του λόγου του κλπ.).