I make sure I'm in total compliance with gun postings wherever I'm at.
Which means if they don't carry the force of law, they can bite me.
They can also bite me where they do carry the force of law if they aren't posted IAW jurisdictional statutes.
SC, for example, is very specific about sign requirements...exact size, wording, letting size, symbol, and posting requirements. The perfect sign posted knee high is NOT posted in accordance with the requirements and makes me smile. And if there are multiple entrances into a building and the door I enter isn't posted? Well, that makes me smile, too.