Arguing against government services while still using them is not in any way hypocritical, precisely because you have already paid for those services with taxes. For example, I am not a fan of social security and how it is managed, but you can be damn sure I will use it once I reach the required age, because I have already paid for it. I will be trying to get the money that was taken from me back.
I think socialized medicine is a huge, clunky band-aid on top of a broken healthcare system already made worse by government intervention, but I won't stop going into hospitals if the US adopted a fully socialized healthcare system.