- Insinuating that any form of athletic competition is "not a real sport" or its participants are "not real athletes" will almost certainly result in a backlash from fans. Along with motorsports, golf and especially cheerleading tend to be frequent targets.
- Calling a foil, epee, or sabre a "sword" will get you mocked mercilessly among fencers. Getting two of them confused will probably draw a negative response.
- In Australia, confusing Australian Rules Football and Rugby. For that matter, in New South Wales and Queensland, confusing Rugby League and Rugby Union.
- Do not refer to Manchester United as "Man U". This was done by United fans at one time, but it led to a spate of chants by fans of other teams that used it as the first two syllables of "manure".
- Do not get Manchester United mixed up with Manchester City, lest you be forever branded as a noob (or worse, an American). They are completely different teams bitter rivals in fact that wear completely different colours and play in completely different stadiums.note
- Rugby Union doesn't have rules, it has laws. Ignore this when talking to a rugby fan at your peril. The same applies for cricket.
- Refer to any supplement as a steroid in front of a Body Builder, or say they are similar, or say they have a similar use, or say that there is no difference between the two. If that Body Builder doesn't just react with violence, he's sure to go off on a diatribe about why supplements are definitely not steroids.
- If you're going to talk about NASCAR on the air, you should never under any circumstances make the claim that drivers aren't athletes. When Donovan McNabb made the claim on November 15, 2013 that Jimmie Johnson isn't an athlete, the online fandom exploded. By midnight, the hashtag #PeopleWhoAreMoreOfAnAthleteThanDonovanMcNabb was trending nationally on Twitter, with people using as examples Toronto's semi-deposednote former mayor Rob Ford, or Manti Te'o's fictional girlfriend.
- When referring to one of the vehicles driven in NASCAR, it should be called a "stock car" ("NASCAR stock car" is also acceptable, albeit a bit redundant). But "a NASCAR" will immediately, pun intended, throw a red flag out at whoever's saying it; the word "car" is represented by only the "C" in the acronym ("National Association for Stock Car Auto Racing"). On the contrary, the "stock" adjective need not apply to the truck series—just "truck" suffices there.
- Don't confuse Indy cars with Formula One cars. While Formula One cars have raced at Indianapolis Motor Speedway in the past (the Indianapolis 500 itself even counted towards the Formula One World Championship from 1950 to 1960), and several famous drivers have been successful in both series, the two are headquartered in completely different continents and haven't raced together since the 1960 Indianapolis 500.
- The only team you can refer to as "the All Blacks" is the 15-man team that plays in Rugby Championships and World Cups. Never refer to the Māori All Blacksnote or the All Blacks Sevensnote as "the All Blacks", or assume they are the same.
- Mixed Martial Arts:
- Calling MMA "Ultimate Fighting." This is like calling basketball "NBA." The Ultimate Fighting Championship is the biggest promotion within the sport, but the sport itself is called "mixed martial arts," and the fighters are called "mixed martial artists" or "MMA fighters", not "Ultimate Fighters." Referring to the sport or fighters as such is an immediate signal to fans to start ignoring you.
- Don't confuse the New Orleans Saints' chant "Who dat?" with the Cincinnati Bengals' chant "Who dey?".
Fandom Enraging Misconception / Sports