“That’s just the way he/she is” is most often offered as an explanation for impolite or unorthodox behavior i.e. someone who is a jerk. It can also be used to describe someone who is thoughtful. More often than not, it is a catch phrase intended to gloss over someone’s toxic behavior.
At a social function, my sister and I were introduced by a “just the way she is” person who pointed out that my sister was the “fun one”. Having made that point, with no further introductory comments, she slithered to her next prey. Just when I needed them most, my stock supply of snappy come backs failed to materialize and everyone within hearing range scurried to the adult beverage queue for doubles. A bystander attempting to deflect the awkwardness commented, “That’s just the way she is”.
“That’s just the way she is” is double speak meaning the offender is obnoxious, proud of the distinction, and has no intention of doing anything about it. It’s a free pass to behave badly. If I have the misfortune of being near that individual again, I hope my cryptic comebacks kick in. If not, I may pull her hair, because that’s just the way I am.