I never understand these threads. Every year around this time, (sometimes even Boxing Day,) someone posts a thread saying 'AIBU to take all the Christmas stuff down? I have had enough, it's boring, sod the lights, fuck the tinsel, bollocks to the Christmas tree, blah blah blah.........'
If you want to take it down 24-48 hours after Christmas day, you don't need anyone's permission. Just do it.
There does seem to this competitive 'I am pissed off with Christmas now' thing on mumsnet, EVERY YEAR, with posters trying to out-do each other with how grumpy and curmudgeonly they feel about Christmas now, and how desperate they are to take the decorations, Christmas tree, and twinkly lights down ... Sometimes on Boxing Day! 
It's a bit attention-seeking. Just take it all down. No-one cares!