Not a question of caring but an observation for me. Yes, I do care when they talk endlessly when I want to go on to my next set. I sometimes cut them off saying I have to get to my next set. I know one guy took offense and he doesn't chat with me anymore. I take my workouts seriously and I have work to do. I remember one guy telling me I was out of shape because I was breathing so hard and my shirt was drenched. He never gets out of breath and his shirt is dry. He doesn't break a sweat working out because he is not exerting himself.
Anyway, there are so many things to observe with human nature. Don't get me going on the locker room situation. Let's just say I might go in there once a year. I avoid it. One convict was screaming at a guy in the gym with plenty of threats of violence. The gym owner got between them. At one point I thought the convict was going to hit him with a plate. The other guy left the gym and the convict remained. I call him convict because of his criminal convictions both old and recent. Nice guy to talk with. I asked him what the hell was that about. He said the guy dropped his pants playing with his cock staring at him. I started laughing and he seemed to let his temper go. I guess the guy was looking for a "date" thought if he's in the locker room he's there looking for sex too. Anyway soon after; maybe a month, the convict's house was raided with a swat team. The rumor was he was dealing drugs. I don't know if they were recreational, steroids or both.
So many observations in the gym. It's like going to the zoo. One guy looks like a real gargoyle. He's old and hunched over. The poor guy can barely walk. He shows up at the gym with this knock out blonde. She always has her hair done and make up on with lip stick to work out. I don't know if she is flirting with me or she is really friendly. I guess it's the cynic in me that I can't give her the benefit of the doubt that she is just a friendly person. Shame on me. Never seen a more mismatched couple. I know it makes me sound like a scum bag for observing this. If they are happy who am I to comment but I can't help it. 
I find it really odd the women who just use the cardio equipment. I see the same women time after time go on a treadmill, elliptical, or bikes that rarely if ever use the weights. Why join a gym for that? Buy a treadmill and stay home if you don't want to run outside. Different strokes for different folks. ...and so on and so on and scooby scooby do on. Sly and the Family Stone for you younger guys.
I should stick to my basement gym. Then I can only be critical of myself.
Well, having only yourself to criticize might get really boring and it would be such a downer. However, if I had a basement, I'd have a gym in it. Sometimes, (more lately) I like staying home. Minus any equipment to speak of, my home workouts are limited.
I'm surprised you only use the locker room once a year. If you get as sweaty as you suggest, isn't it uncomfortable leaving the gym in wet clothes? What do you do in the winter? It's probably not the best idea to go out in freezing temperatures wearing wet, sweaty gym clothes and no jacket.
The most shocking thing I think I've seen in a gym locker room was about a year ago and these two fellows were kissing at the local 24 Hour Fitness club near where I live. Although it was only a brief, sweet kiss, there were other dudes around...either a brave or stupid thing to do. Nobody said anything, but they surely saw them. -Hard not to miss. Seen them since, but not kissing.
At a different gym, there was this biker looking older fellow standing around naked in the locker room who had so much cock jewelry on that it was hard not to notice. He was not only wearing several cock rings, his dick head was pierced and he was wearing a large thick ring through that hole. He also had a lot of tattoos. He seemed in no hurry to put some clothes on.
It would be a bit weird to get hit on in the locker room. I'd very likely ignore the person and get out of there as quickly as possible. I don't think I'd say anything to them. I definitely wouldn't make a scene like the convict did.