This is me exactly. My daughters have friends over and they hold the snakes all the time. The first question I ask any new friend is what type of pets do you have at home. If there is any type of exotic that could have something that would infect my collection the snakes are off limits. None of my snakes are off limits. They are not fragile animals and my kids understand how to handle them. If my hets ever produce an albino pied I might reconsider that last statement.
When dealing with other snake people that I don't know very well I always have hand sanitizer. If possible I prefer to meet somewhere but on the rare times I have to meet them at my house I make sure in conversation that I mention the security system and Bullmastiffs. They never come inside. Maybe I'm a little paranoid.