Looking at dictionaries it can be either a holiday at home or a holiday in your home country, depending on the dictionary. Do there you have it no one is right or wrong!
But those are two distinctive terms. I could say that I sometimes travel north (from the Midlands) to Glasgow and that I sometimes travel south to Glasgow from the same place - I can say both of those, but only one of them is actually correct (unless I'm bizarrely going 'the long way' around the world via Antarctica and the Arctic).
Dictionaries are descriptive and not prescriptive, so they simply report on how people use words and terms, even if they are using them wrongly - if enough people do so. Look at 'dice' and 'pence' as very commonly (but incorrectly) used as if they were singular words.
Not even just dictionaries: even a lot of 'official' bodies will, for example, assume that a month = four weeks exactly. GP surgeries will prescribe 56 tablets, to be taken daily, and then deny a repeat request 8 weeks later as 'too early' as two complete calendar months haven't yet passed.
Loving how people are assuming that OP is constantly frothing and gnashing her teeth in abject despair at this cruel, painful, rank injustice, when she's made it clear that she merely finds it rather irksome 