The number of harassment at any company should be 0. You may not have meant it this way, but your comment makes it sound as if the goal should be to keep harassment down to some average number.
And crimes rates should be 0. We should also have infinite food and drink. People shouldn't get ill. Etc. Etc. Most people would rather deal with reality then criticize from an impossible dream world standard.
Yes, it must be 0, but people are people. You get 10 000 employees, probably some 7-8 000 of them are men, so the remaining 2 000 women will receive a lot of crap. Proportionally more than if the split was 50/50, so SpaceX needs to adjust for that.
Same is true in areas dominated by women, if you are the only guy in a group of female nurses you will almost certainly receive the most physically draining work the whole time for the same pay. You will also hear a lot of sexist jokes about men, and quite likely receive potentially unwanted sexual attention.
Issues should be reasonably and earnestly managed. At some point, noise, misinterpretations, and false reports will emerge and form a floor.
One strives toward but does not insist upon ideals.