I don't think that's what is being said here. Sex is better when it's free, because then it's likely enriched with some kind of emotional bond (even if not love), whereas in case of paid sex you're just getting a service. Regardless of what the N++ developer(s) think, the statement doesn't criticize prostitution.
Your statement is valuing one form of sex over another. The point is that value isn't held by everyone, and asserting it as fact is diminishing someone else's entirely legitimate perspective.
Conversation is pointless as OP has now responded saying he simply doesn't like hearing about sex.
Yes, I shared my opinion, I'm aware it was subjective. If sharing one's opinion is diminishing someone's perspective and that's bad, then why did you just do the same? On a similar matter, if conversation is pointless, why did you bother to write your message? :D