Not really wanting to jump in the middle of this battle, but for me it comes down to shot quality and humor!
If someone shows up at the range as you desribed and hits it like a 10 handicap or worse I guess I find humor in that. They literally make me laugh, sometimes out loud. There's no reason to feel anger towards someone like this, they obviuosly enjoy the game enough to buy expensive equipment and support the golf industry and that's a good thing. If they show up all dressed up and can actually hit the ball then I enjoy watching them swing and there is a level of respect there because I know they have dedicated time and energy into the game as I have.
This is funny because I am both of these guys you describe. I will occasionally show up at the range dressed nice (nice golf pants, shirt, and sweater or vest) and other times I will show up in basketball shorts and a mis-matching t-shirt. Sometimes I will hit it well and look like I "deserve" to be wearing said nice clothes and other times not so much. I haven't paid enough attention yet, though, to see if there is any correlation between how well I am hitting it and how I am dressed. Maybe I should!
I'm still racking my brain to come up with a guy I find annoying on the practice green but I guess here's one: The guy who removes the little stick out of one hole and basically "claims" it as his own for the time being. Since most people practice putting the same way ... Hit a few balls towards one hole, then look around for an open one, hit towards that, and so on and so on, I guess I'd say it's a little annoying that one guy decides for himself that the rest of us (for the time being) don't get to use that one.
This would only be really annoying on a busy green and/or if multiple people were doing it, and when I see it, its usually during quiet times.