Internet searches reveal that Http://rexcurry.net is the first, or one of the first to use the phrases below.  It’s the site that coined the concepts "don't say public schools" and "never say public schools" while advocating that the term “government schools” should be substituted.  It is remarkable that these philosophical phrases have not been expressed before now on the internet.  To learn more about the issue see http://rexcurry.net/schoolsmain.html     To learn more on the related issue of "government property" (not "public property")  see http://rexcurry.net/property.html     For other fascinating rexisms with word-scoring and phrase-scoring results see http://rexcurry.net/full_blooded_tampan.html   The first number is the number of hits on the web, the second number is the number of hits in groups.

"never say public schools" 1, 1
“always say government schools” 1, 1
"don't say public schools"  0, 1
"call them government schools" 0, 0
"don't call them public schools" 1, 0
"call it a government school" 0, 2  
"don't call it a public school" 0, 1
"say government schools" 25, 18

Here are some other comparison searches
"public school" 3,090,000    266,000
"government school"  85,200   9,480

"public schools" 3,660,000   294,000
"government schools" 166,000    24,200

non-government schools  20,500    393
non-government school   6,400      88

"true public schools"   52     76
"true public school"    84    50

"real public schools"   48    32
"real public school"    346    58