In itself, it's not a pressure.
"X, come to partay"
"nthxk, but thanks for the offer. I'd like to be at home, I actually don't like to partay/I'm doing summat else"
"Ah OK X, no probs, enjoy it then"
But that's not what happens, is it? It always goes:
"X come to partay"
"nthxk, but thanks for the offer. I'd like to be at home, I actually don't like to partay/I'm doing summat else"
"really? But it's Xmas/so and so's birthday/my dog's wedding anniversary/Rosa Parks appreciation day"
"yeah I know, but all the same thanks, really I mean it"
"Are you sure???"
"yeah"
"but it'll be fun!"
.......................
"what's wrong with X? What a weirdo"
Or "what the ****'s wrong with you you ****ing poof?! Don't be so gay!"
Repeat for another ten people who ask you.