A need for … mutual respect
Interestingly, and somewhat amusing, Ron Paul gets named as one of the most bipartisan members of the GOP. I suspect a better description would be non-partisan, or perhaps just crank.
Republicans who bash Ron Paul do so to their own detriment—by alienating those who are new to the Republican party (which one could easily argue that Republican party does sorely need—especially among young people), those who have their firm place in the big tent of freedom and small government.
There is no such thing as "RINO from libertarian party". The only reason we need a libertarian party at all is because the Republican party lost its way: if Republican party didn't get taken over by neo-cons and kept to its principle of small government and free enterprise, libertarian party may have existed but would only have attracted fringe groups—why join a smaller, extremist group (which can be taken over easily by someone whose ideals you do not share), when a large, stable group advocates positions consistent with your belief?
And as far as the one position on which Ron Paul disagrees with mainstream Republicans go, well, a policy of non-intervention (or, given that we don't live in the ideal world, minimal intervention) is the only policy sustainable over long term. Empires never last (where is Rome now?); Republics that do not meddle in others' affair, however, do, as we can see in the fact that Britain survived the "fall" of British empire (although one should admit that there aren't enough data points here ...).
The way I understand it, Ron Paul's position isn't that we shouldn't intervene in others' affairs because we are wimps. It's because we have to conserve our strength for really big things, and it's because a government that constantly needs an external enemy is one that will eventually turn on her own (as you can see in recent abuses of PATRIOT act and so on).
Besides, as for Founding Fathers not being non-interventionists, well, they weren't perfect. When they strayed from the principle of "peace, commerce, and honest friendship with all nations, entangling alliances with none" (such as when U.S. got into the British-French war with war of 1812) is when they got the nation into needless, bloody war that America almost lost on her own soil.
Regardless of whether one agrees with his advocacy of non-intervention, it is no basis for illogical ridiculing. Ron Paul and real Republicans agree on the fundamentals: freedom and small government. We can work out these ... details later. We can't lose forest for the trees and let statists run rampant while we exhaust ourselves in infighting.