To some, any shot taken when the opposition is in front of the 3/9 line is a HO. I avoid HO's long before they happen. Almost without fail, I can duck a HO attempt, and convert to their 6.
I had someone attempt a rope on me, stall and as they rolled over towards me nose down, I popped them in the canopy, they cried HO. Of course this player is well know for being a dictionary resource for "reasons why it's not my fault I died".
I usually ignore them when they cry. They get a new plane and it's only a game. <S>