Exclude Scripts (Google tags, FB Pixel) on all blog posts and the blog page on a specific Multisite. Filter is added on Head, Footer and Body tag.

exclude_scripts

function excluding_blogs_header() {
// exclude from Posts Page (blog) page and all blog posts on the Main site (multisite)
if( !is_single() && !is_home() && 1 === get_current_blog_id() ) {
$code = "<script> Your script here </script>";
} else {

  $code = null;
}
  echo $code;
}
add_action( 'wp_head', 'excluding_blogs_header', 15 );

function excluding_blogs_footer() {
if( !is_single() && !is_home() && 1 === get_current_blog_id() ) {
$code = "<script> Your script here </script>";
} else {

  $code = null;
}
  echo $code;
}
add_action( 'wp_footer', 'excluding_blogs_footer', 15 );

function excluding_blogs_body() {
if( !is_single() && !is_home() && 1 === get_current_blog_id() ) {
$code = "<script> Your script here </script>";
} else {

  $code = null;
}
  echo $code;
}
add_action( 'wp_body_open', 'excluding_blogs_body', 15 );