Trying to stop triggered abilities with things that stop activated abilities does not work. This is not a bug, since triggered abilities and activated abilities are different things. Only activated abilities can be activated. Only triggered abilities can trigger. Activated abilities cannot be triggered. Triggered abilities cannot activate. Magic uses the words "activate" and "trigger" with specific in-game meanings, and only those meanings, they are not interchangeble.

An activated abiliy ALWAYS has the form [cost]:[effect]. This template may be hidden in the rules for keyword abilities (like equip), but is otherwise present in the text box of the card.

A triggered ability ALWAYS uses the words "when", "whenever", or "at" to describe its trigger condition. If it doesn't use any of those words, it is not a triggered ability. Specifically the word "if" followed by a condition does NOT denote a triggered ability, but is instead an indicator for a replacement effect.