What do you think about me refusing to do someone a favor?
What would make you refuse a favor?
The people who asked me to do the favor are know-it-alls and supercilious pricks.
If you can't or won't do something, just be honest and tell the person so that they don't feel misled.
I agree, so I'm telling them no.
That's your right as a human being, just keep in mind they likely won't do you any favors in the future.