I daresay I'm pretty good at playing pyro, and I always extinguish my teammates, it's just not fun to see them burning.

(My weapon loadout is The Degreaser, Strange Detonator and Axtinguisher. If anyone wants to trade; I'm looking for Strange Degreaser and Strange Axtinguisher)

(at risk of sounding like a douche) Pyro probably doesn't have any ammo left for flammenwerfer, which explains why a pyro is walking around with a shotgun.