You should rely on facts, rather than petty insults.

Here this very matter is discussed: https://www.jneurosci.org/content/36/7/2077

>Sagan's biographers have argued that the Academy's rejection of Sagan, and Harvard's prior denial of his tenure, were the direct consequence of the phenomenon that has become known as the “Sagan Effect”: the perception that popular, visible scientists are worse academics than those scientists who do not engage in public discourse. Yet, later analyses of Sagan's output have indicated that his academic contributions compared favorably to those of other Academy members

You may want to read about the "Carl Sagan effect".