If someone were to wear one, I would suggest trying not to look out of place. We get a lot (A LOT) of "winter visitors" in this area of the country, and many of them wear fanny packs. OK, November to March. But if you're in your 20's or 30's or 40's, any time of the year here, you'd probably look out of place. I might consider one in only the hottest of months, on a trip, but other than that, no. As for 90% of the people not knowing about fanny-pack holsters - OK. But I'm more concerned over the 10% of the people who DO know about them, and while some are LEOs, the rest are possible BGs. And if you fall in that 10%, then yes, you can usually tell who is "fanny-packing." Just my opinion (mixed with some experience) from the area.
Be comfortable AND safe...good luck!