Do pet boy rats fight?
Rats engage in a lot of physical activity together, running, jumping on each other, and standing on hind legs to box at each other. These are all types of play-fighting. Real fighting is more serious, and usually involves attacks on the rump. You can find more information here: http://www.ratbehavior.org/norway_rat_ethogram.htm#PlayFighting.
Pet rats are not vermin. Pet rats are raised in a pet store, laboratory, or adoption center and they are raised to be pets or in the case of labs, experiments. if you are thinking of buying a rat remember not to buy a rat raised as food for snakes. Rats bred to be pets are much gentler and sweeter than rats raised as food.