See mate, others are not obligated to respect what you respect or even share your opinion. You could tell them politely but that is the most you can do. Since this the big chink in your armour (argument) hence people will be trolling you if not calling you stupid or something of that nature.
Ah i see that bro, troll will always troll. Lucky we still have some people like you in this world. At least i was just try to be polite in replying and trying not to fall into the hole of hate cause of trolls.
It's fine to respect a culture, but that shouldn't lead to censorship.
What I mean is, there will be people with opposing views on everything, people wanting to express things (and people just getting stiff messed up), and we can't demand they be silent, simply because we don't agree.
You came in there, lecturing and telling him what he could and couldn't put in his art. I would have probably argued with you over pm, because I wouldn't want your censorship plastered all over my picture comments either.