They say that "gender" is an artificial social construct and there are more than two.

Ok, let's assume they are right - what follows is that if "gender" indeed is a social construct, then there may be any number of genders. But they all are defined by the norms of the particular culture.

Which means that they are right when they say that there are more than two genders, because in their SJW culture it indeed is so, and we are also right when we say that there are only two genders.

They are right, and we are right - all in the scope of the same assumption that gender" is an artificial social construct.

The elephant in the room which we have come to and must openly admit at this point is that they and us represent two different incompatible cultures. We are in the middle of a culture war where this new culture which still has to be given a name, is trying to eradicate our culture of traditional European values.