He was in his own subjective reality and didn't really care anymore.
他沉浸在自己的主观现实中，不再关心（是梦还是现实）了。
老子的人生智慧
Again, because of our subjective realities, whether something appears problematic differs per person.
同样，由于我们的主观现实，某件事是否是问题因人而异。
1The Eternal Validity of the Soul
I am sure will startle you as you become more aware of your own subjective reality.
当您越来越了解自己的主观现实时，我相信您会大吃一惊。
英语百科
Subjective character of experience
（重定向自Subjective reality）
The subjective character of experience is a term in psychology and the philosophy of mind denoting that all subjective phenomena are associated with a single point of view ("ego"). The term was coined and illuminated by Thomas Nagel in his famous paper "What Is it Like to Be a Bat?"