As for gifts giving - I think the top commenter meant "unwrapping gifts" upon receipt rather than "accepting" them or not accepting. Coming from xUSSR, we were also taught that it is more polite to downplay any gift received and leave unpacking for later, instead express utmost gratitude to the giver upon receipt, rather than to a quality/essence of the gift itself. It also makes it less embarassing for those who gave a very modest gift, but the recipient expresses equal gratitude to everyone (like on a birthday gift reception) not justifying it by a gift value.

PS: How China is similar to xUSSR! this must be socialist countries attitude of being more humble and downplay achievements.