A crow and raven
There was on outstandingly big grow in the flock of small crow.
This big crow looked down on the other smaller crows and he thought "It's not fun to hang out with these small guys. I'll join the flock of ravens" Then, he actually tried to join them.
But he was much smaller and his voice was different from the ravens, so they thought , "Look.There's a strange one."
And then they gathered and tried to make him go away. He had no choice but return to the flock of crows, but they wouldn't let him join them because they were upset that he looked down on them. That's why he became totally alone.
This could apply to human too. You should think over before you join other groups.