It's not necessarily "hugging" which is the problem here in this thread - what it seems to be is excessive "greeting".
If sims haven't spoken for a while, they need to greet each other again, either with a hug or a kiss on the cheek or whatever other greeting is appropriate.
If both the sims are sitting at a table eating, it interrupts that, they get up, pick up their plates, greet and then put the plates down and resume eating.
This is not the old behaviour. They used to just stay seated and do a simple wave to each other at the table or other seated greeting. This started happening after the Parenthood patch.