As a practicing Hindu I can say that Hinduism has many branches, to blanket Hinduism as polytheistic is incorrect. The teachings differ depending on the line of teachings passed down from teacher to student. In the branch of Vaishnavism, there is one Supreme Being with many names (God, Jehovoah, Yahweh, Allah, Krishna, etc.) and many ways to worship Him.  God is God, no matter what you call Him and how you worship Him. 

Regardless of that, or whether you agree with it or not, it’s very upsetting to see someone trying to dissect the beliefs of others and judge them or cast shade on them and those they work with or associate with based on their religious beliefs. In my mind that is simply called religious bigotry.