Optimally countering deliberate spite calls

[JDalla]

It's definately a quandary... the problem with it all is that they are giving up much less to spite call you than you lose when they call you. So the only retaliation that doesn't simply grant them EV is to spite call them back, in which case you still lose EV, but maybe one day you can have a chat with them and agree to both stop. Very prisioner's dilemma esque.