you think ghosts and skeletons get along?

 or are they always trying to scare each other?

But I think for ghosts, skeletons, ghouls, goblins, frankensteins, draculas, wolfmans, witches, and such, scaring is like their version of being funny

No because then, they would be trying to scare humans. You wouldn't try to scare other scary things. Unless you were the comedian's comedian of spooky frightening things.

So they're like professional acquaintances. They're all in the same line of work. They meet up and talk shop. 

A zombie scaring a mothman but instead of screaming the mothman calmly says, "that's scary" the way comedians say "that's funny" without laughing but it's actually a huge compliment. But both parties are so analytically minded that they forgo the emotional reaction.

The creatures of Halloween are entertainers. Is what we've learned here. They exist to elicit an emotional reaction. I guess that's what Nightmare Before Christmas is about.

This is all the modern versions of course.

Look at this woodcut from 1493

Just some bones having a good ol time. That's really fun.

The thing about Christmas is that at the darkest coldest time of the year when Death feels all around we come together to show the best parts of love and charity and giving. But the thing about Halloween is that the darkness has just come around and so we have wicked fun and dance and evil party hehehe.