I am a practicing Buddhist and have been for more than a decade. This is complete and utter bullshit and a total misunderstanding of the teaching.

You can be detached and still saddened by what you see in the world. Non attachment is not the same as callousness or numbness. If anything, you feel things more deeply.

Thats one way to rationalize your world view on another person. 'Just get over it lol, isnt that, like, your thing?'