Forum:Negate vs Destroy

Easy question, can quick-play spells or trap cards that say "Destroy 1 Spell or Trap card on the field" actually be played when your opponent activates a spell or trap card? It shouldn't be able to negate it, it should only be played when your opponent sets a spell or trap card, then you can play it and destroy the set spell or trap. If it could negate it the card text would say something like "Negate the spell or Trap card" so negate and destroy are different. Example: I play a spell card and my opponent flips "Mystical Space Typhoon" would that really negate it. Or when I play a spell card and my opponent flips "Dust Tornado" would that really negate it? So my point is that cards like that should only be played when your opponent sets a spell or trap card and not activate it.