I came back to knitting when my youngest sister was pregnant with her second child (that would be about two months ago ) and have found it to be more fun this time around. My other sister and I went on a yarn buying binge when I was in Ohio earlier this month and I loaded my carry-on luggage with yarn, needles and other knitting stuff. Suffice it to say, my luggage was searched but I was allowed on the plane with my knitting as I followed all the Trans. Safety Information guidelines (check out their sight if you want to knit on a plane - knitting neeles YES, Chinese fighting stars NO).
The "grandma" thing doesn't really bug me that much but I have been dragging my knitting everywhere and knit whenever I might have a few spare minutes (waiting for the kids are their lessons, waiting for the kids at the movie theater, before church, during a 'boring' movie). Most people who make the comments about being a 'granny' are probably wondering how you can knit.
The LYS snobbery extends to any small craft store. I also scrapbook and was in a great store, but they didn't have a particular brand of paper that I needed. When I asked about it at the checkout, the owner said that she didn't carry it and I asked if she knew of another store that carried it, she said that hers was the only store she shopped at. I relpied that it wasn't the only one I did !