while i think he may have *started out* being clueless /romantic, I think he ended up being rude. for starters - I am not a fan of the "great gift that will cost you $$$$ to use". (My ex was the King of these and never understand why it might be awkward). Obviously, there are often costs related to going out, and it's not *always* rude to buy someone a concert ticket or restaurant meal, but if the recipient is going to have add gas money, hotel, meals, etc for a concert that they wouldn't have gone to otherwise, it becomes an unwelcome gift.
Going to your parents and trying to dictate this gift was rude. the only way it would have been ok is if this was something that he knew that you wanted, something you talked about, something they might have thought of buying you anyway and he is giving them a head's up that he is buying your sister a ticket... but not in the way that he did this.
I agree with those who say he should either *person*-up, buy two tickets, go with the wife, even if it's not his cuppa tea and stop bothering the whole world about this. OR buy her something else.