I'm sorry, but I'm really not interested in yet ANOTHER todo app/website/whatever. Please come up with something innovating. Creating the millionth TODO app and calling it a 'startup' is just not going to work. We have enough of these things. There's no need for it, and it certainly shouldn't be called a business, because it simply isn't. (the same goes for the thousands of project management apps, hour tracker apps,…
unnecessarily negative, belittling, and mean-spirited. has putting this person down made you feel better about yourself?
You can be very kind and tell him that the idea is awesome and that he will become a millionaire, but please be a bit more realistic and just tell him the truth.