Saying that something is 'gay' is, especially among young people, an oft-heard put-down/insult when describing the disdain and contempt felt toward someone else's cringe-inducing, affected, precious, and pretentious behavior.
Linguist Geoffrey Nunberg explained this NPR; he is quoted below to clarify the scope of this usage:
Very early on after gay became the acceptable standard name for what we now think of as the gay community, it was transformed into this word that means lame, unpleasant, stupid, sometimes disgusting, whatever.
I currently also use the word in that sense and call cringy/pretentious things/behaviour 'gay'; I want to stop using that word improperly.
So, to summarize: what is an alternative adjective I can use to communicate my disdain when faced with such things? (cringe-inducing, affected, precious, and pretentious)