My classmates sometimes complain about things while we have meals together.  I don't like hearing their complaining. It makes me feel gloomy and stressful.

For me, I rarely complain. My life philosophy is kinda like getting far away from bad mood, bad luck, bad things... If can't, forget them.

Yeah, dump them! Dump all the negative thoughts, feelings, etc. Get rid of them.

Have fun living your life!