I suspect the kind of people who have Christmas bedding aren’t the kind of people who care about waste or their environmental impact.
Well your suspicions would be wrong then.
The bedding set we have is not a waste as it is reused year after year and saves on wear and tear of the other sets for that period - in reality, it just takes longer to get to the end of its life than some other sets have as they get used more regularly - but we have been using it for a few years now and will continue to while DD likes it (and will probably then recycle either through the family or charity shop).
The same with the 2nd plastic crockery set we bought toddler DD back in the day. She had 1 set, and it was constantly washed and used again, so I bought a 2nd coming up to Christmas which was a plate, small plate, bowl, mug and glass. They all got very well used while she was a toddler and meant I had a spare set to not need to wash up immediately after every use. But we did concentrate on the flowery set as the main set most of the year, so that did end up getting some bits broken and the rest completely faded/scratched etc so was dumped at some point (maybe when DD was about 4?). But the Santa set is still in reasonable repair, and none of the bits got broken, so it is still stored carefully with the decorations and the festively decorated mugs/cream jug/plate that we have gathered over the years and use for the 6 weeks or so. (Some of those were presents, 1 from a gluhwein at a market on a trip to visit family near Christmas over 15 years ago, and I bought the jug myself when scattering my DGM's ashes as it really reminded me of her).
In our household though, we use public transport and bicycles a lot, capture rainwater for the garden (and occasionally indoors - the deep freeze of 2010 meant water supplies were cut off due to leaks so it was very useful for buckets to throw down the toilet), I have my composter going since 1999 in the garden, we grow some of our own veg (I had an allotment for 5 years, but as other life pressures intervened, I now only grow in the garden but that is fairly productive despite its small space), have been buying AAA+ rated appliances since we bought our first house in 1999, and only replaced when they died (washing machine last year, microwave earlier this year), we buy plenty of things 2nd hand and recycle a lot either through the family or charity shops as they are grown out of or no longer useful to us, we use solar power to charge phones, have very efficient heating system and have greatly improved the insulation etc in this house since we got it...….
But we also like a bit of frivolity in our lives.
So on a year that DD had managed to put a hole in an old duvet shortly before Christmas, the new set we bought was a festive themed set.
Shoot me now for killing the planet.....