Daas Yochid- How can it be ???? ???”??
First of all the qoute from Rav Shimon Schwab tz”l by Lior says that they are not halachikly assur, just not in the spirit of the Torah.
Also, when the Rema writes “??? ????? ??????” he is talking about things that have no logical reason so we are scared that they have a smell of Avodah Zarah from their ancestors. Gifts are not avodah zarah in it of itself like a christmas tree. They are used to make the holiday more enjoyable. You understand yourself that giving a gift is a nice thing to do on a special occasion. A christmas tree doesn’t make any sense and it is a pagan symbol.