Sometimes, a trope isn't the tree. It's the whole forest.
That is, when you see something used in fiction, it can seem to not mean anything. It's an artistic choice on the part of the creator, but it has no actual meaning beyond that and you might be tempted to label it "not a trope."
Until you look at a whole genre, or even all of fiction, and notice that this particular artistic choice happens a lot. A lot more than it ever happens in Real Life, in fact. It's nearly universal to a genre.
What you have here is an Aggregate Trope. It's a storytelling pattern, but that pattern only becomes apparent when you take all the examples as a whole rather than look at individual examples. The key word here, is "tendency".
Compare Garnishing the Story (in that the pattern is completed by the notion that the elements improve a story by their inclusion).
Tropes that are only a trope in aggregate:
- Acceptable Feminine Goals and Traits
- All Abusers Are Male
- All Men Are Perverts
- All Women Are Lustful
- All Women Are Prudes
- Black Dude Dies First
- Bury Your Gays
- But Not Too Bi
- But Not Too Black
- But Not Too Evil
- But Not Too Foreign
- But Not Too Gay
- But Not Too White
- Double Standard: Abuse, Female on Male
- Everybody Is Single
- Fandom-Specific Plot
- Girl-on-Girl Is Hot (When paired with hate for Guy-on-Guy Is Hot) note
- Heroic Build
- Hollywood Beauty Standards
- Most Common Superpower
- Improbable Infant Survival
- Never a Self-Made Woman
- Girls Are Really Scared of Horror Movies
- I'm a Man; I Can't Help It
- Lesbian Cop
- Men Are Tough
- Men Are Generic, Women Are Special
- Men Get Old, Women Get Replaced
- My Girl Is Not a Slut
- No Bisexuals
- Nobody Over 50 Is Gay
- Obvious Crossover Method
- Quantity vs. Quality
- Real Men Hate Affection
- Real Women Don't Wear Dresses
- The Smurfette Principle
- Sour Prudes
- There Are No Therapists
- Token Lesbian
- Transgender Fetishization
- Vanity Is Feminine
- Vasquez Always Dies
- Villains Act, Heroes React
- Wet Blanket Wife
- Women Are Delicate
- World of No Grandparents
- You Have to Have Jews
