I have taught my 7 and 8 year olds that when you receive a gift, whether you like it or not, you give a big smile and thank the gift giver. They know that the gift is not as important as the thought that went into it. You are thanking the gift giver for their time and thoughts too.
AND, you never, ever complain or say ANYTHING negative about the gift.
In the blogging world, it's not unheard of to receive gifts, samples, goodie bags etc. These come from someone. Some business has spent time and money on making and distributing these items and they thought you were worth it. Maybe they are small, not our thing, not worth much or not relevant to our blog or readers. It doesn't mean they don't deserve our good manners.
There are nice ways to say thanks but no thanks.
If you receive a gift bag, thank the relevant people.
Use a hashtag to link it back to them.
and please don't bitch or complain.