Yes, that is true. Oscar the Grouch did let Rizzo bunk with him in "Muppet Family Christmas", but I do not think Oscar would like to be friends with the muppets from the Muppet Show either. He might like their interest in violence (though mild), wisecracking, and cynical and sarcastic humor, but they are still goofy and are still as gentle hearted, good minded, and good willed as their "Sesame Street" counterparts, even Sam the Eagle has a good mind, will, and heart, though he is very non social. However, I can see Oscar liking Statler and Waldorf more than any muppet on "the Muppet Show", but then again, if he is friends with Elmo and Telly Monster, then he can be friends with Kermit, Fozzie, Gonzo, and the rest of the gang.
Muppetmonster