I agree that RV only parks are sometimes a better clientele , but many seasonal RV parks can not survive w/o a permanent source of income, as snowbirds are only there 4-6 months of the year.
I quantify it this way, if there is more than one blue tarp in the park, it's probably a little on the tacky side and given a choice, we don't stay there.
If you want RV's only, go to a State, National, COE, or BLM park. Problem is most limit your stay. Some do not.
We have stayed in many parks that have some mobile and park model residents and most are very nice folks. Many are seasonal. just like you. They just choose not to drag their home around with them. We have met many very nice folks staying in these parks. IMHO, it's not really a problem. Trace