Someone clearly doesn't know the definition of slander.
Either way, having a low post count and no feedback and then insisting on payment methods where the buyer has no way of getting their money back if something goes wrong are potential big red flags.
You've got two posts, & no feedback, irrespective of your situation, as unfortunate as it may be, we try to look out for everyone on here, in much the same way if someone else was selling the same deal & you were thinking about buying, we would happily comment if we thought it looked like a risky transaction, & hopefully stop you losing your money.
Don't take it personally, it ain't, it's just some red flags have to be mentioned for the good of everyone.