Opsec prevents you becoming a topic of general conversation. Low profile in everything that is different from the Joneses. For the things that stand out, develop a few cover stories, like my "too many kids" and "canning is a hobby" examples. Keep them handy and use them enough that they roll out of you smoothly and believably. You would be surprised how quickly most public aspects of prepping are quickly overlooked when the observer classifies you as a bumpkin with possibly a low level of education. Most people have a strong desire to be better/smarter/whatever than the next guy, and when you let them think they have that over you, they pat you on the head and explain, "aren't you so sweet".
I have no problem with someone I don't know (and consequently don't care about) thinking I am a simpleton.
Understand, I am "that guy" in my neighborhood. I have a lot of hobbies like 4x4ing (jeeping) and such. It is common for me to be welding in my garage, building a chicken coop out back, building a stone wall/patio, whatever. It explains why I have lots of tools and am always bringing home supplies. My neighbors have never thought that I may be a prepper. They may think I am warped in the head, but not specifically that I prep. Works for me. Course when something needs fixed, I am the one most of them ask how to do it. Most of my neighbors would be shocked to find out my education level and what I do for a living. And I am fine with that. I prefer to exude the "I have nothing you could want" atmosphere.