Sofia Vergara Joe Manganiello

Sofía Vergara might be taking a subtle dig at her ex-husband, Joe Manganiello, with her social media activity ... sharing a post about narcissistic men after he trashed her in his new memoir.

Here's the deal ... Sofia's son -- Manolo -- initially shared the post on his social media, which explains the difference between good guys and narcissists.

Among the attributes listed ... good guys apologize, set boundaries, and tell the truth. On the flip side, narcissists gaslight, lie, and "act like Peter Pan."