About T-Shirt Design
The joke on Gen_X I Don't Care Thanks T-Shirt is easy to understand, and that is a big part of why it works. It fits really well with everyday humor, but you do not have to be obsessed with that stuff to enjoy the joke.
It makes sense for casual days or birthdays, especially if the person already likes this kind of humor. If you already like funny t shirts, this one fits right in without feeling like the same old joke. Fans of sarcasm shirts will probably like that the joke is direct and not too polished. It is not trying to be deep. It is just a funny shirt with a good line on it.