To sum up the advice you've been given so far:
Rearing is a potentially dangerous behavior that should not be taken lightly.
Your first job is to figure out what's triggering the behavior. Rule out fear and pain first; then tackle it as a training issue. Is it from confusion/clashing aids? Is it a learned behavior to avoid work? Is it in response to another external stimuli, ie, from being held back on the way home?
Then, work on eliminating whatever triggers the behavior.
Riding out the rear has been described very well above - stay forward, with your hands in the mane until the horse comes down; then ride agressively forward.
Preventing the rear - if you feel the horse get light in his front end; engage his hind end. Ask for some lateral movement, both as a distraction and to keep him from planting his hind end prior to rearing.
GREAT ADVICE, all of it.
Nobody's bashing you; everyone has taken time to respond to a potentially dangerous situation out of concern for your welfare.
Do consider that to a group of horse trainers and committed horse people, statements like "He does it because he's bored" and "He doesn't mean it" are likely to be questioned.
Hope this helps, happy trails.