An altercation

So Sarah is upset with me because I said that it was "not worth it" to spend $35 on a ticket to a Broadway show for which her dad was going to pay the other $30. Apparently there is something invaluable which I can get out of the experience, an experience which I won't be able to repeat often in the future, or something to that effect. And she took major offense when I suggested an alternate activity in NYC, such as going to the Central Park Zoo. Now, if she really knew me, she would know that I am obsessed with zoos and it would fulfill a major goal of mine to be able to go there. But instead, she sees it as an affront that I would prefer to go to such a place than to spend her father's money on a ticket to the theatre. I am perfectly willing for her father to pay for the tickets to the zoo...
And my other reasons for not wanting to pay that much to go to Broadway is that we are going with the school the following week for only $15, and additionally, I am so near-sighted that I can barely see anything that happens on stage anyway and would almost rather just listen to the soundtrack. I guess there are some things you just can't explain properly...
Throughout this, I am trying to remain cool and open-minded. But I really do not appreciate being hung up on...