Eww that sounds so nasty.
I have to say from all the state parks we visit most places are not piggy :)
bathhouses are never desirable but most are reasonably clean so far and we haven't encountered the total yucky in all our years of travels.
we use our rv facilities and use a blue tote as needed. I have full facilities at my fingertips, and paid a good price for them :) so we sure use our own rv.
mostly I wonder about all using the bathhouses in droves and they own fully contained rvs also??? too lazy to dump their tanks when needed I guess???