Anonymous,I recently responded to a thread wrongly assuming that the writer was male not female. The topic was one where I might have said the wrong thing and genuinely hurt somebody or at least hurt instead of helped.
A very kind and sensible Mudcatter sent me a private message explaining my mistake. I was embarraassed but very grateful.
The truth will make you free.
Re: straight or gay. It's no one's business. But if by not correcting them they are made to feel foolish (maybe offering advice, names of organizations, whatever, in a spirit of genuine friendship), think about saying something.