I pick and choose...

if my SIL starts to tell me for the millionth time how her youngest 'only' had to cry for 4 nights in a row and then slept through... I turn my ears off.

If its someone random telling us to try this, that or the other, I usually do let them know that we prefer 'gentle' techniques.

If someone tells me that she's got us wrapped around her little finger, and she needs to 'learn who is boss', then I usually start my tirade. No holds bar for them