Not only not rude, but considerate as well. An infection is not a gift I think anyone wants for Christmas.
I hope you feel better soon! I can relate...I'm sick right now, too. That pretty much scraps our plans for midnight mass tonight, but I think God will understand. We can pray at home and make it up another time.
Pod. I've been nursing a cold since Thursday. Didn't go to Nights 6-9 of the novena, didn't go to Mass tonight with DF, won't be joining him tomorrow when he goes to his aunt and uncle's for Christmas. There are some things that are just unavoidable (I've spent today and yesterday mostly sleeping trying to get over this cold).
Rudeness would be other people holding it against you for not going out when you are sick.
Totally agree with SoCalVal. It sucks to be sick any time, but especially when one has a special occasion. However, I couldn't hold it against anyone for re-scheduling plans to spare me or my loved ones from anything contagious. I just wish whomever the individual was who passed on this particular gift that keeps on giving (the sneezes, aches, pains and incessant coughing) had stayed home...if they knew they were sick.
That's why I get so irritated (privately) when one of DH's co-irkers comes to work anyway when they are very obviously sick, especially when they have copious PTO time stored up but choose to "save" it for a vacation....I have compassion for people who feel they have to work because they can't afford to NOT work, but, well, anyway. I guess that's for a different thread.
OP, I hope you feel better soon and please, please don't feel rude for protecting your hosts' health and staying home to regain yours. Merry Christmas to you!