Speaking as a pretty consistently right-wing Catholic…
Would I be offended by your class? I dunno. Context means a great deal. If you’re doing a presentation in which controversies over subject matter is the primary topic, then there’s no way to avoid displaying some works that are widely considered offensive. That’s just the nature of the topic.
Fact is, a very conservative, religious teacher who wanted to do a presentation about “Piss Christ” or Mapplethorpe’s erotica would probably have to risk offending his audience by showing some graphic images. That can’t be helped. When the subject matter calls for it, sometimes a teacher has to risk offending people.
But in this case, the risk for you does NOT lie with the subject matter itself. IF your presentation is even-handed, you probably won’t get any flak from the audience just for showing a slide of “Piss Christ” or of a naked Karen Finley covered in chocolate syrup. Mature people are capable of looking at disturbing or offensive images, provided they believe the lecturer is being dispassionate and objective, and has an educational purpose in mind.
The tone of your presentation is key. Which of these is closer to your planned approach:
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"Over the past few decades, several different works of art have caused great outrage, leading to angry protests and even boycotts. Let’s look at some of the works that have provoked such a reaction, and let’s discuss…
a) Was the outrage justified?
b) Did the artist INTEND to be offensive, or did peop,e completely misunderstand his message?
c) What is the proper response, if and when you feel your values have been offended?"
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“Wacko conservative Christians keep trying to squash artistic creativity. Here are some of the works of art that REALLY got their goat! Can you believe those neanderthals wanted to censor this? Wha ta bunch of fascistic assholes!”
If it’s the former, feel free to display all the controversial art you want. If it’s the latter, don’t act surprised or hurt if your audience is offended.
Here’s an idea- your audience probably ALREADY knows (or thinks it knows) what to expect from you. Surprise them. Sure, show “Piss Christ,” or that dung-covered portrait of the Virgin Mary- but you should also make a point of including some pieces that will make the Left-wingers in your audience uncomfortable.
Why not include that portrait of Chicago mayor Harold Washington in drag? The portrait that had black Chicagoans up in arms?
Find some anti-semitic art or some homophobic stories.
Better yet, why don’t you display all the anti-Muslim cartoons from that Danish periodical?
If your presentation serves only to reinforce smug feelings of superiority, you’ve wasted your time. I think you have an obligation to show EVERYONE in the audience something that will outrage them, and get each of them to wonder what the proper response is to offensive art.