Opening a present is not, by itself, an act of worship to the sun (as they claim celebrating Christmas is--and its roots are, in fact, part of celebrating the rebirth of the sun). But, if the hounders rule it as "brazen conduct", they could get you for "brazen conduct". Even going online could be "brazen conduct" if they nag you once for it, even if it is common in the congregation that everyone else is encouraged to do it.
In fact, any act could be termed "brazen conduct". One could be disfellowshipped, for instance, on "brazen conduct" charges if they are asked to learn Spanish for field circus, and instead they decided to learn German. Or even refusing to learn Spanish is enough, if they decide it is "brazen conduct".
Think that is bad? When Noahide Law is in full effect, the authorities in charge could decide that anything could be "tying into energy outside joke-hova" or "blaspheming god". By going along with this "brazen conduct" rule, they are preparing the astral, and the congregation, for full imposition of Noahide Law. Just as harmless at first appearance, just as deceptive, and then they wonder why I will not go to boasting sessions. Or why I "disfellowshipped" the whole religion, and joke-hova itself, for this deceptive practice.
At least with Sharia Law, as bad as it is, what you see is all you get.