Sorry for the bad tour. It’s hard to feel so let down by a school that has been swimming happily in our heads and dreams.
I would take the unprepared/boring tour guide issue as a small data point and set it aside. Surely there are other guides at that school who are fantastic and what if you had lucked out and gotten one of them? The school would still be the same school. So, I guess wouldn’t let one person stand for an entire community, good or bad.
But what is more interesting is the overall feel you described and the general tone of many of the students you saw. That I think is super important. As my mom used to say to me: when people tell you who they are, believe them. The overall tone of the school does not seem to be a fit for you or your kid and I think that is totally fine! If student is admitted and this school is for some reason in play for you still come March 11th, well you can dive in deeper then. Until then, vent away! We had a couple of tours that pulled the schools right off our list too. (Although we did them in the fall so pre-application.)
(But FWIW I would completely disagree with the suggestion someone made above that perhaps a school would be annoyed that you are touring close to the deadline. I absolutely think schools know the scheduling can be tricky. I wouldn’t worry one tiny bit about this.)