I'm liberal, and if you want decentralized government, it's okay by me. It is, in fact, a platform plank of the Green Party.
However, I live in Alabama, and when I hear someone talk about state's rights, it's usually because of poorly disguised resentment over racial integration. People say the Civil War was really about state's rights, but they're unable to name one important state right Alabama lost except for the right to own people. Though the slavery argument may not be correctly directed at you, it is not exactly a strawman argument.
If you want people to stop directing these arguments at you, you should loudly and clearly distance yourself from the modern cult of "conservatism" that claims to want limited government, but is glad to, for example, vote away a state's right to allow gay people to marry with the power of a Constitutional amendment.