They are a bit xenophobic but as long as you know the boundaries and customs and abide by them, they won’t bother you or be bothered by you. If one of them approaches you and wants to practice some English, fine, but it’s best to just keep to yourself around strangers. Two big no-nos are do NOT blow your nose at the table and, unless invited by a local, leave the bath houses only to them.
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I must be part Japanese.
The other one is when you buy a train ticket, make sure it’s for where you are really going. They really seem to have a problem with those that use the “addfare” machines in the stations if you didn’t pay for where you end up, even if it’s an honest mistake.