If you know someone you don't get along with, why would you take advice from them? Especially in a time of crisis? I suppose people don't expect others to be expressly looking out for their worst interests. Sucks to be them.
I may have just gotten a co-worker, Arturo, fired. I work in a yet-undisclosed customer service field (imagine that, a jaded customer service professional!), and as anyone with two brain cells to rub together knows, the customer is always right (to his face). Arturo got into a disagreement with a customer, and it escalated to said customer yelling and demanding to speak with a manager. At this point you just let it go and move on, these morons aren't worth the stress. Well apparently Arty was having a bad day, because he just could not let this go. He was steaming over what this guy had said to management. He was considering catching the guy on his way out and discussing it with him. Well, I'm far from above manipulating the less fortunate for my own amusement, so of course I egged him on.
"Oh hell yeah man. You gotta say something. You can't let people just walk all over you like that."
Arturo took the advice, caught the guy on his way out, and started screaming at him. The two were literally yelling in each other's faces, two feet away from other customers! It didn't take long for a manager to come out, apologize so profusely I thought he was going to go down on the guy right there, and calmly escort Arturo into the back, where a legendary firing occurred. Art was in shock. He just walked out the front like a shell-shocked war veteran in the midst of a PTSD flashback.
Needless to say, I was inconsolable.