When it comes to aerial combat, there are two very basic ideas that form the foundation for every other aspect.
Shoot the other guy, and don't get shot yourself.
The reason to avoid the HO isn't because it's a cheap shot- you should avoid it because it's dangerous, and it breaks one of the two basic rules (don't get shot).
Unless you're getting ganged, or have reached a point of not having enough E to manuever, avoiding HO's isn't tough at all. I'd class it as a simple, basic, beginner-level exercise. Chop throttle to slow down and land, pull out of your dives early enough to avoid augering, and try not to let the other guy shoot you.
If you give the other guy a shot-solution, you should expect him to fire. For him to not fire would cheapen the fight. If my merge is so poor as to offer a "beginner" an opportunity to end the fight at it's very beginning, how "advanced" are my skills?
Give me a good reason why a 12 O'clock shot isn't exactly as legitimate as a 6 O'clock shot, or a 10 O'clock shot, or a 3 O'clock-high shot.
You're not supposed to let the other guy shoot you! No matter what! It doesn't matter if he's above you, below you, next to you, behind you, in front of you, in a blue plane, or a red plane, wearing funny goggles, drinking beer, or whatever! You're not supposed to let him shoot you! If you're getting shot, you're not doing what you're supposed to do!