A toxic person tries to devalue everything. All your ideas, activities, thoughts. Doesn't respect your choice. Criticizes not constructively, but to hurt and lower self-esteem. On the Internet, such people often write anonymous insulting comments, they put everything in a bad light. In life, too, they try to hurt someone, to prick. After talking with such a person, after a while it becomes clear.
Whoever says what, but a toxic person can be recognized:Toxic Person Test
Having lived with him for some time and sharing life together (hostel, on a hike, in a camp, fishing with an overnight stay ...)
When using alcohol, the main thing is to know who and what drinks will help to reveal:
for men and guys mowing under them - beer, whiskey, vodka, cognac, moonshine (non-toxic will load and fall asleep)
Hidden cameras (hidden filming on a smartphone) in his permanent place of residence with his family: communication style and attitude to the needs of others will immediately show a toxic psyche