Unfortunately if someone says anything these days, someone will believe it. Take the proliferation of conspiracy theories some of them with the slightest examination can be seen to be totally unfeasible however still they go on, no moon landing, crop circles etc.
Due to the internet any old crap can be put up and sustained with no real evidence. In the case of sexuality I don’t think you can change a true gay person, and as it has nothing to do with me, why would you try? But a number of people are unsure about their sexuality and take one road when they later realise they really wanted to take the other road, then when they change then people think they can be “converted”, when in fact they were never one thing or another in the first place.
I really don’t understand why you would want to attempt to change a person’s sexual choice after all it has nothing to with you. If they did change they would only be unhappy.
After all if you out with people the only question that needs to answered isn’t who do you sleep with but do you stand your round.