You are saying that conferences should not be like parties, because conferences are not like parties. You are just using your restricted definition of conference (not like a party) to support what you think a conference should be (not like a party). My take on it is that some conferences empirically do have many similarities to parties. This doesn't make them 'not conferences', so saying "their job is to organize a conference, not a party" is setting up a dichotomy that doesn't actually exist.
If that isn't your sort of conference, then no problem, not everything is for everybody. Personally I prefer more intimate technical conversations over a beer, a bar napkin, and a cellphone than sterile professional presentations in front of a whiteboard. Obviously you do not, and that is perfectly fine as well. There is room in this world for both; there is no reason to discourage one or the other from existing.