There were a number of people making less than that at Gravity Payments; so it seems likely that there are other qualified people in the area who will appreciate the salary that you are now grumpy over.
In fact, apparently 1000s are applying to Gravity Payments hoping to take any grumpy person's job.
So if you are grumpy and 9-5ing it (as you said); why should Gravity Payments keep you?
How would your stated attitude help you work with people who did get a raise?
Who said I would be grumpy or toxic? Just working the same hours as my peers would actually probably make me less grumpy. I'd be very happy and grateful to adjust my effort downwards if I can keep my same salary.
Don't be so certain that the company will be sad to see you leave. The people who replace you might be even better than you.