Hindus worship Brahman in the form of a cow. The cow is a very useful animal for humans. Also the Chandogya Upanishad says that all is Brahman. So in this spirit Brahman is worshipped through a cow. An person not aware of this subtle distinction may very well conclude that a person is worshipping a cow.
Goddess as a cow
May that goddess, who is here ...
I would like to supplement the answers given above. It seems that at some point of time the cow became identified with Brahman.
Goddess as cow
Thereafter Brahma went on meditation. He saw the excellent cow of the
Great Lord. In her universal form it had come out of his mouth. It had
four feet, four faces, four hands, four udders, four eyes, four horns,