What does it mean by "not standing sh"t" here in this sentence?

Also, do others treat her different than you? Because of her behaviour and not standing sh"t

Question

What does it mean by "not standing sh"t" here in this sentence?

>Also, do others treat her different than you? Because of her behaviour and not standing sh"t

Answer

She doesn't take any nonsense for anyone.

Answer

She doesn't let anybody insult or bully her. She fights back.

"Stand" can mean "endure" or "tolerate."

"These shoes hurt, but I only need to wear them for an hour. I can stand the pain." 
"I don't mind hot weather, but I can't stand cold weather."

The bad word can mean "an insult" or bullying.