Hi all, maybe this is a delicate question but I trust you all to provide helpful advice on a sensitive topic.

I am thinking to go travel in Japan with a friend who is a US citizen, but a tall clearly Indian guy.

This is purely for leisure, going to scenic places, eating, sleeping, hot springs, spas, train trips -- you know an enjoyable guys' trip for fun.

How are foreign Indian-looking guys treated in this context by the average Japanese person/shopkeeper/tourist operator?

I ask not for the purpose of deciding whether to go, which I have already enthusiastically decided, but rather to know in advance of any issues or how to make the trip good for my buddy. As in, are there any prejudices or explanations that I can keep in mind to make the trip better if he encounters this? Unfortunately, I have heard that Japanese are not the most charitable when it comes to brown folks...

Or please correct me if I myself have a misperception.

Thank you, all.