[noun] + ときている [na-adj] + ときている [i-adj] + ときている [verb plain] + ときている [sentence (plain)] + ときている
The grammar pattern ときている is used to highlight a characteristic, trait, or circumstance – often a negative or problematic one – and present it as an additional reason or contributing factor that makes a situation worse (or, less commonly, better). It carries a strong tone of criticism, exasperation, or emphasis, as if to say "and on top of that…" or "what's more…".
It is derived from と (quotative/conditional) + きている来ている (lit. "it has come to be"), conveying the nuance that "things have reached the point where…" or "given that it is the case that…".
ときている is used to point out someone's inherent quality, habit, or a situational fact, and then connect it to a consequence or judgment – usually negative.
The clause before ときている states a fact or characteristic, and the surrounding context makes clear why this is noteworthy. Often the sentence continues with a result or conclusion: