This spring sometime, we had a customer come in who wanted to send a small tropical arrangement to a friend. The flower shop dutifully threw something together and sent it out, and . . . well, I'm a little fuzzy on whether the recipient brought it back or whether she just declined to accept it and then called the store about it. But either way, the arrangement came back, and we heard about it from the recipient later that day, who berated the front counter person (not that she had had anything to do with taking the order, putting the planter together, or any of the rest of it) to the point where she nearly cried. It was something to the general effect of, we oughta be ashamed, the planter we sent had a diseased plant in it, and she was a Master Gardener so she knew there was something really wrong with this one, and so on for what was apparently a really long time. I heard all this second-hand from the boss and the front counter person (I think I was at lunch when this all went down), so I don't know how involved the cussing-out got.
The problem is, the plant that generated the objection, a Philodendron 'Moonlight,' was not, in fact, diseased or infested or otherwise unhealthy. 'Moonlight,' like many Philodendrons, will develop lighter-colored spots on its leaves if they are damaged during development. The damage may be from spider mites biting the developing leaf, or from the leaf being bent under another leaf while unfurling, or anything else that might cause little pinprick-type damage to veins, but once it's there, it's permanent.
I first saw this on a Philodendron 'Imperial Red,' which I wound up buying. I didn't know that spots weren't normal for that cultivar until the new growth started coming in without them. Since then, I've seen it on the other self-heading Philodendrons ('Autumn' and 'Prince of Orange'), as well as Ficus lyrata, F. triangularis and Homalomena 'Emerald Gem.' (The Ficus spots tend to be reddish-brown, unlike the others, which are usually just a lighter version of the leaf's normal color.)
It's not that big of a deal. It doesn't mean your plant is sick. It doesn't even mean your plant has ever been sick. And even if it were a sick plant, that wouldn't justify huffing and puffing and trying to pull rank because you're a Master Gardener and the store employee you're abusing isn't. Call up the store, explain the situation, talk like you're a human being and not like you're the Pope. (Who may also be a human being. Unverified. I'll let you know.) Being a certified Master Gardener doesn't make you infallible; it just means that after you're gone we all shake our heads sadly at what a moron you are, and cluck our tongues at how the MG standards have clearly declined.
Being a jackass, though, does make you a jackass. So, you know, your choice.