I think the Christians that did that should not have acted so rude. Destroyed their witness.
Other details seem to show this was a hoax.
But how many Christians, asked to come up with a bible verse on the issue, will come up with this one, rather than 1 Cor 6:11?
IT MATTERS. One is law, the other gospel. The ones who come up with 1 Cor 6:11 probably will have far greater rewards in heaven if the rest of their conduct is in sync with it.