Haha, loved that thread. One of the all time bests.
Definitely sarcasm. X and people like the guy at your gym somehow don't understand that beating down a weak part of the movement doesn't force the other muscles to work harder, it simply causes failure to happen sooner.
An interesting thing with bench is that in myriad studies you get better pec activation with a narrower grip, and it's due to the increased range of motion vertically and the greater movement of the humerus throughout the lift. So my advice would be to narrow grip to inside the rings somewhere (but not in the smooth or anything crazy) and not overtuck the elbows.
If you bench in a slight arc, you'll get contribution from all the muscle fibers in the pecs. If you look at a picture of the pecs, you'll notice that the fibers running along outer part will be at the best mechanical advantage in a decline, so they're important to the bottom of the lift. As you arc back (slightly) you can see where the fibers running across the middle of the chest are at a greater advantage to contribute to lockout. This is one reason why it's crazy to consider the lockout as the triceps phase...really you will hurt your lockout by not involving the pecs more.
In short, bench correctly and you'll hit the pecs just fine. Always good to do inclines as well.