I don't mean to be offensive but can't we tell the difference between how a word is used?

[MineralMan]

3. Lots of words have multiple definitions.

It's part of the English language. Context reveals which definition applies.

Just because someone sniggers at "gay apparel" doesn't mean that the word does not mean "festive" in that context.

And, just in case someone isn't familiar with the word "snigger":

snig·ger
ˈsnigər/Submit
noun
1.
a smothered or half-suppressed laugh.
verb
1.
give a smothered or half-suppressed laugh.
"the boys at school were sure to snigger at him behind his back"

English is, and always will be, an interesting language.