When you say something that could be considered stereotyping or racist, but it is phrased in a non-negative way.

The safeguarding of Earth and other worlds from biological cross-contamination (i.e. billionaires with too much time on their hands).

Also known as “planetary protection.” Planetary protection / quarantine “reflects both the unknown nature of the space environment and the desire of the scientific community to preserve the pristine nature of celestial bodies until they can be studied in detail.”

There are two types of interplanetary contamination. Forward contamination is the transfer of viable organisms from Earth to another celestial body. Back contamination is the transfer of extraterrestrial organisms, if such exist, back to the Earth's biosphere.

Any stereotype of any particular group of people that is perceived asmore positive than negative (for example, the stereotype that all Canadians are nice is a positive one).

Of course though, it should be noted that not all groups of people fit positive stereotypes most of the time and that they are bound to fit the more negative ones, so it would be best to not stereotype any group at all (no matter how good or bad the stereotype may be).