If you believe that you are doing web design wrong.
I'm not saying it's right, I'm saying it's typical.
Isn't the whole point of responsive that you don't design for 'typical' screen sizes?
Responsive design means the browser resolution doesn't matter. Sites should be able to handle these dimensions by scaling appropriately and changing the layout.
Ever heard of tablets?
I'm using a windowed multitasking OS (it's even called Windows!) and have multiple windows open at various sizes. Pretty neat stuff!
Wow. I guess that means you can resize your browser then, meaning this entire discussion is unnecessary. ;)
If a website doesn't fit my preferred browser size, I leave the website. If you're expecting people to resize their browser window, you're in for some disappointment.
Sad! In all seriousness, I guess I wasn't clear enough. I should've added "/s" after my ";)"