Eid Mubarak for each people can means anything. There are someone who love Eid Mubarak, and also hate it.
I have a friend who hate Eid Mubarak, because he hate a culture which he look like an event for showing something that new. Like new shirt, new car, and new anything. Of course who can't have a new thing, will hate this event. But not at all. In Indonesia, it's happen.
Beside it, usually their family ask anything that anoying like, when you get married? Or when you have a job?
I think this problem is only about perspective. When you think seriously, you will be down. You can doing some jokes for answer their question. Do something which can avoiding you get more depth question. You can answer 'on a day after tomorrow' for every when question.