Interesting. So, "high" being better than low, you freely admit that considering porn usage to be immoral is accurate. You're actually agreeing with the other poster, but you're pissed about it. You must have to hide your porn, too.
Either you're a troll, or you don't understand what the phrase "high horse" means. I'll assume the second, and define it for you:
WordNet 3.0 said:high horse
noun
an attitude of arrogant superiority; "get off your high horse and admit you are wrong"
Being on a high horse has no connotation of being better. It does have a connotation of being an ******.