Seeing fat people eat unhealthy food makes me furious.
That seems like an overreaction. Why are you so bothered by seeing them eat unhealthy food?
I want to bash them for eating a lot, but they are not harming anyone so I restrain from doing so.
While it may not be the most healthy thing for people to overeat, it is not really your job to tell them. Understand that the people probably know that they are overweight, and them continueing to eat is not necessarily something they even want to be doing.
No. Obese people don't realize just how fat they are. Whatever. I'll get over it.
I can assure you that the vast majority of obese people realize that they are living an unhealthy lifestyle. It's extremely difficult for many people to lose weight and eat less even if they want to. You should try to be less judgmental of others because of their weight and focus on yourself instead.