Yes, how very nice, that in a big huge country with tons of ice rinks your synchro competitions would be held separately, and you have strictly-run practice sessions. Sadly, that's not the norm. In Australia Nationals is held once only each year, so all divisions are together - Synchro, Adult and Championship. And it's rare to have leveled practices, though Synchro is expected to have their own practice, I have heard many stories of synchro brats doing synchro moves on regular practices and getting in everyone's way.
And I was not impressed, at Nationals, to sit through the screaming and ludicrous carry-on - and we were not talking about small children here - with a headache, only to see the synchro skaters all flounce out of the rink after further delaying the Adults by mucking around on the ice post-medal ceremony, instead of doing them the common courtesy of watching. It would not have killed them. I've noticed Theatre on Ice tends to do this as well. It disgusts me.
You only have to look at the attitudes of people in synchro towards their inclusion in the Olympics to see the entitled brat attitude that pervades their discipline. "Oh, just build another few stories on the hotel!" "It's just another 150+ athletes, who cares?" "Kick Ice Dance out then!"
This is very sad. I truly very sorry to hear this. I can assure you that this is definitely not something that any synchronized skater, coach, or fan would endorse or encourage. No wonder you have a difficult time enjoying this discipline. I would probably feel the same way.
I think it would be good for the officers of the local skating club to contact the national skating federation, tell them what's going on, and request that they step in and educate the synchronized skaters and their families about proper etiquette.
I don't think this happens in the European countries. I can't imagine the Russian federation encouraging this kind of rudeness. I could be wrong, of course.
I don't think it has anything to do with small size of skating population. Rudeness should not be allowed in the skating community.
Synchronized skating competitions in the U.S. and Canada are rowdy but polite. I don't think they are any more rowdy than Singles/Pairs/Dance competitions, though. It's just that there are there are more family members and friends in the audience because of the increased number of skaters (which means more money spent on tickets and concessions). I've attended plenty of non-qualifying and qualifying Singles/Pairs/Dance competitions where the cheering is pretty loud! (And that's good, IMO! We need to let our skaters know that we love them and wish them well.)
Also, keep in mind that at many synchronized skating competitions, the younger teams are in the audience to support the older synchro teams in their club. This means that the little girls (and boys) will "squeal" and that can be kind of irritating. But it's the way it is--little children have shrill voices that can induce headaches at times.
But again, rudeness should not be allowed, especially by little children who should be trained in proper rink etiquette.
From what I have seen for the last 25 years, synchronized skaters fully support their friends who are involved with other skating disciplines. In fact, in the U.S., often the synchronized skating competitions are scheduled during major Singles/Pairs/Dance competitions, and many times, I've seen the synchro skaters, coaches, and families sitting in front of a TV (and now they have iPads) and watching the Singles competition during their synchro competition. I remember one year when I was having lunch with the coaches, and we were in a fairly-empty bar, and we asked the bartender to turn the set to Nationals, and he did so, and we watched the Singles/Pairs/Dance competitors while we ate!
Again, I'm really sorry that this is the way it is for you. Yuck.
Again, I encourage you, if you are in a position to do so, to try to get your national skating federation to put a stop to this kind of rude behavior by your synchro skaters. This just isn't right at all.