I wouldn't ask the same person to check it if I was doubting them. They would most likely tell you the wrong sex again.
I am guessing this is for a snake you are looking to buy and do not have at the moment so you can not do it yourself or take it to a trusted place.
I don't think I would say it would be rude but I don't see the reasoning to do it. I think if it were me and I was worried about getting a certain sex I would ask for some kind of sex guarantee. However depending on the snake in question it may not be possible. I am only responding to the little you gave me to work with.
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