Why do people think it is okay?

Why do people think it is okay to put their baby in a "My mom is a fox" onesie?

Why do people think it is okay to eat ice cream out of the pint container while walking down the lake front running path?

Why do people think it is okay to wear spandex?

Why do people think it is okay to do these things? Is it okay if I tell them that it's not? I have seen all of these things recently. It was painful, but I survived. If you see any of the above, please help me help them and tell them that is is not okay.