I have been to concerts where if you stood in one part of the venue certain bass notes would turn music into a jumble.

However—since you mention getting out of your (presumably otherwise quiet?) house onto the street—I also encountered a phenomenon in which presence of subtle other noise (which in your case could be tree leaves rustling and so on, and in my case was a literal white noise machine) make a sound that in a completely quiet room would drive me insane significantly less of a problem. This is not to say “it is all in your head” because, well, how you perceive it is what matters at the end of the day.

Hopefully your bass player neighbour could understand and use headphones or practice at a different time.