I constructed a team using belcher/parrot along with a massive taunt unit to pull attacks away from my parrot, etc. None of my opponents attacks obeyed taunt. RNG is already a plague on BG rating, who needs to lose rating to your mechanics not working as well?
Sounds like your opponent had a Sin’dorei Straight Shot, which removed taunt from your minion.
Sin'dorei Straight Shot
Whenever this attacks, remove Reborn and Taunt from the target.