Flip it into a positive, embrace the radical label. When Reagan was in a debate and his opponent tried to slam him for his age, Reagan said he wouldn't hold his opponents youth and inexperience against him - that's the approach Republicans need to take when faced with the memes of the Left. For example:
The Left has labeled us as "Radicals", well they're right, we are radicals. Our country was founded on some pretty radical ideas; individual rights, individual liberty, individual prosperity and those are the same radical ideas we carry today. The Democrats will tell you they are the "moderates"and they're right about that too. They are the party of mediocrity. They seek a mediocre economy, a mediocre military, a mediocre country, mediocre advancement of the individual so as to avoid any type of inequality - their "moderate" party is pushing for a mediocre country filled with mediocre people who aren't any more exceptional than any other country or people on earth.
We believe that every individual citizen has the potential to be exceptional and they deserves better than government mandated mediocrity. We believe the US is the greatest country in the world and that our people, every individual citizen, should have the freedom to pursue their own happiness, break free of mediocrity, rise to their own individual level of greatness and prosperity, and bring about another American renaissance. The Republican party IS radical, we want radical growth of the economy, radical prosperity - for every individual - and we are equally radical about protecting the rights and freedoms that allow individuals to achieve greatness and fulfill their own potential.