[tester34]

>When we apply "toxic" to a person or his behaviour, we borrow that seriousness.

what makes you think so?

words means in theirs contextes whatever people attributed to them, and I've never seen toxic used in other context than somebody trashtalking somebody and being called toxic, so definitely not dangerous.

[bill_mon]

> what makes you think so?

Because that's how language works. You don't call somebody a neanderthal to imply he has great hair.

[tester34]

>Because that's how language works.

Exactly, language changes dynamically

People years ago started using "toxic" to describe people who are negatively affecting them - e.g in games via trashtalk.