I've pointed out to close friends and family "there are people who walk into a room and look for something to complain about, and they will always find something because nothing is too small for them to complain about". That's a habit, and it's a pretty annoying one if you're living with someone who does that, and I have lived with a few who did. After dealing it with for a long time I finally came up with that respo…
Weak, frustrated and attention seekers ? I often view them as people in fear of something that enjoy the reflex of negative / toxic behavior just to get a reaction from their environment.
It's not the easiest to come neutral and honest about how you feel, bored, lonely, scared, or to ask for friendly interactions taking others into account. (I did that too, now I try to stay relaxed and cool)