When I was out grocery shopping, a girl at the counter complimented my Penny Arcade portal shirt. T-shirt compliments are funny because most of the time, the person wearing the shirt isn’t the one who designed it. T-shirt compliments more than anything are really about someone complimenting the person themselves or saying something like “I like how you think.” The other thing is just a sentiment of “I like that you like the same thing I like” which I think is more what this compliment was about.