I have had the privilege of mixing with the gay community over the last 45 years or more.
But even I, a pensioner, have noticed how 'trendy' it is for young adults to claim to be bi. I doubt the majority are.
But boundaries have been pushed further and further and it gets harder to shock the oldies.
And rebelling against the norm has been an essential part of growing up for years. And least claiming to be bi harms no-one.
I am looking forward to seeing what the next trend is.