Patrick, Tori and Cat Friendship
He enjoys hanging out with the girls along with his best friend Spongebob and he thinks they're good people and funny as well, especially Cat and the reason is incredibly obviously as to why. Cat finds his stupidity to be quite hilarious, she always did and Tori feels the same as well, although it can also get on her nerves at times too and can also frustrate her depending on the situation.
Don't get him wrong, he doesn't hate them in the slightest, but sometimes, he did get jealous once in a while if Spongebob spends too much time with them or gives them a little too much attention. Sometimes it's to the point where he feels like the girls are trying to take his best friend away from him but the girls tell him that they would never steal Spongebob away from him since they know how important their friendship is considering the two have been best friends for way longer before Tori and Cat came into the picture.
Eventually he completely accepted Tori and Cat as one of his best friends the more they started to hang out with him and Spongebob.