I thought that "bigot" was a swear word because I heard someone call someone else that as an insult (which i guess it is but I didn't know what it meant, figured it just meant jerk or asshole or something)
A childhood belief about swearing

others believed things like this
- For years I heard the word "pedophile" and thought it meant a pedicurist's tool.— Lauren
- I used to believe that "nuptial" was a naughty word. I thought it meant nipple. XD— Sara Hagen
- When I first heard the words "flea market", I actually thought it meant "selling fleas".Anon
- My sister used to think that "spit" was a bad word. She meant "shit".— "Spit!"
- my husband believed, until recently, that the word "several" meant seven of something. — sheryl
- i used to think the word "friendship" meant a special kind of rocketship that you went on with your friends.— chips ahoy!