Slam my head agains the wall? that’s what I do sometimes – that and discuss all this incredulous ignorance with my husband. I think it’s good to debate, not argue, with someone that you consider ignorant – it’s also good to always question your own beliefs and ideas, in case what they tell you makes more sense than what you’ve thought all along. It they were my students (because I am a trained educator in relation to sexuality and gender) I would address it (I’ve done it hundreds of times) but if ignoring them was the best thing for you, then good for you. As for changing people’s opinions, the answer is a resounding yes, in that it is possible and has happened a lot of times.