[Ernie Martin]

As we're on final into a strong (25 kts) headwind, a person who heretofore I considered knowledgeable says "Don't put full flaps because of the headwind". When I, surprised, ask why, he says, "you'll float too much, take too much runway too land". I pushed a bit more, reminding him that full flaps adds considerably more drag than it does lift, but he wouldn't budge. I left it at that.

Here's my take. The aircraft doesn't know about the headwind. It doesn't affect drag or aerodynamics. The body of air in which I'm flying is going "backwards" at 25 kts, and the only consequence is that my ground speed is 25 kts less (say, 60 kts instead of the 85 kts airspeed). If anything, I'm going to use less runway (regardless of flap setting) because at, say, 70 kts touchdown I'm only doing 45 kts over the runway.

Am I missing something here? Is he right? Full flaps into a strong headwind will cause added float?

Ernie