No kidding! I have worked in the restaurant business, and not only have I *NEVER* tampered with anyone's food or drink, despite some shocking customers, I would fire anyone I caught doing so. The insinuation that most (or even just some) servers are that disgusting is incredibly insulting. Do accountants or lawyers who are treated poorly by their client smear bodily fluids on paperwork, or deliberately not wash their hands after using the loo if they are going to be shaking their clients hands, or doctors who are dealing with stroppy patients lick instruments before using them? No, they don't - expect the same professionalism from your server, don't assume they are some low-life who doesn't care about their job, just because you* don't. That isn't to say I would expect a warm welcome next time, my refills might come out a bit slower, but I'd still expect them to be professional, and my food sanitary.

* posters who think this, not the poster I quoted!