1. blocking others from the weights

Apparently your workout is more important than everyone else's, so you can stand in front of all the weights while I just try to slide in through the cloud of your armpit stench, not cool.  

Unless you have a good reason, just step away.  If you cannot lift the weight 2-5 feet away from the rack, lift a new weight...

2. Using the Bench Press for Things other than Bench Press

Again, what makes you so special? 
If I am trying to bench press, and I see someone doing leg lifts I am going to be pretty upset.  You can do leg lifts on the ground, on a mat, or on a different bench. Sure, maybe there are no other benches open, but remember, these are leg lifts on a flat bench, you can do them on flat ground too! Here's How --->

3. Taking over when I walk away for less than a minute

My bag is marking my spot.  You can say this is territory claim.
"Oh, someone's bag is here, they must be using it, I will wait until they are done"
                               vs.
"Oh, someone's bag is here, I am going to move it, or pretend like  I didn't see it and start working out here so when they come back they will either not say anything or we can have an awkward confrontation" 

Come on people.  Be considerate, I sure hope that is not the only thing in your workout for the day, if it isn't do something else until I am done, and if it is then there is a problem. No one should have to worry about someone taking their machine when they are clearly using it.  If anything just ASK TO WORK IN! 9/10 you will probably be able to, not everyone is a gym doueuighrfieugf. This does lead me to my next point though...

4. Don't get mad when I take your machine because you were gone for more than 10 minutes talking and hanging out who know's where. 

nuff said

5. Throwin' weights around

It's one thing to fail, it is another thing to throw a weight just caz "you can".  

if you can't control the weight and put it on the ground or in a rack, ask for help or lift a lighter weight.  There are exceptions to this so don't start flippin out like, "What about Deadlifts?!" "What if I can't Lift it?"  
Of course 100 is going down harder and louder then 10 pounds, but let's be real, you don't need to throw it down or add unnecessary flare.  The video to the right does not depict that they can go down how they can come up but they can...
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I am talking to the people who do it to turn heads, or because they are you know whats and they just do it to do it.  If you can lift 100 pounds up and dumbbell bench press one in each hand, I sure as hell hope you can guide the weight back down.  Here is an example, Watch how when he put the weights down he doesn't just let them collapse to the floor, rip out his shoulder, injure the person next to him and cause an earthquake, then look around to make sure everyone saw, it can be much more simple:

6. Ego lifting- Improper form

This one is a bit tricky to talk about.  

Maybe you don't know what the proper form is.  But then again, when would you ever allow your knees to touch when squatting?  Or deadlifting with a hunchback?  But then again, not everyone knows, and that is OKAY!!! but what is NOT OKAY, is NOT ASKING.  If you don't know if you are doing it right then ask.  If you need help, ask.  If you KNOW, and you still do it wrong, then fix it or leave.  Stop being an ego lifter.  Your 315 quarter squat is embarrassing and painful to watch. I am not trying to be rude, but I am sure it comes off that way.  This is serious, this is not as big of a joke as maybe it sounds.  It is real. If you are doing ego lifting more than proper weight lifting, then that is a problem that your body will not thank you for and you will be stuck wondering WHY AM I NOT GETTING RESULTS.??

But this is especially to the people throwin up dumbbell curls with their whole body. NOT impressed.  You want to get big, or gain strength? Then do it right, your muscle needs to be engaged and contracting, it cannot do that when you only use momentum to throw up  30 pounds more of a weight you CANNOT lift properly.  You must feel the muscle contract and isolate it to see results. This goes for all movements... 

Proper technique for front squat, high bar squat, and low bar squat. Keep in mind, knees are not in! Pushing out and through the heels is what you are trying to do, generating power through your lower body and engaging your hips!

This Is not a very long list, but these are a few of my least favorite things. If you agree, Let me know, if you disagree, hmmm?? ;) 

Remember, to always have the back story, or gain understanding before bashing, commenting, or questioning people on the internet.  I always see people saying their piece before all their questions are answered.  Talk about it before you TAAALKKKK about it!