Toxic people are those who bring you down in work and also life. They spread negative emotions to you and make you feel depressed or not as optimistic after talking to them. Their actions generated so much negativity that the whole working or group environment will feel the change and dislike their job and everything else.
Example 1:
A good friend of mine insults and puts down my potential love interests and new friends. He will point out their flaws and made me reconsider my friendship with the rest. I did not know it at that time but he will also say bad things about me behind my back or join others to ridicule me.
Example 2:
This ex-colleague was really friendly in front during working hours. After working hours when I bumped into him, he did not even acknowledge me when I greeted him outside. Whenever I made a mistake, he ......