"that" phase

My 3 year old daughter is at that phase where she's testing the rules. She's still miserable most days without her nap, and she tries to walk all over us like she sees her friends doing with their parents. I'm not the type of parent to just let my child disrespect everyone, throw tantrums over nothing, yell at people, etc. It pisses me off that a lot of parents in my area just let their kids do and have anything they want. It makes having a well behaved child almost impossible. We're the meanest parents ever😓