When you meet some of your friends, you feel excited. You feel pumped up and you feel cared for.

While when you meet some of the other friends, your energy gets drained. Enthusiasm lowers each time. And you just don’t feel cared for!
These are the friends you chose to be with.
You were not born into these relationships.
And since you chose them, you can also choose to get out of them.

When you take energy-draining people out of your life, you stand up for yourself. 
That’s not being mean. That’s an act of self-love.