I love SEO. I love talking about SEO. Most non-SEO folk you talk to are generally very nice people. They may not understand everything you say, but they often nod their head and smile. The open-minded may even ask you to look at their site.
On the other hand, there's the non-SEO "expert" (loosely defined as someone who has a cousin in marketing) who represents a different beast altogether. Well intentioned but misinformed, they believe SEO is urban legend, no better than a Ponzi scheme.
Here's what I have to say to a few of the worst offenders. 3 of the top 10
1. SEO is a scam
2. Google will figure it out
3. We did SEO once