where did you get your rats from? how long have you had them and how old are they? if you got them second hadn or even from a pet store at a bit of an older age then a mere baby it could be that they have been too roughly handled by children and are afraid of small people so act all tough to try and scare the kid away. you can try breaking them of this if you know of a kid willing to help and have their parent's permission. make sure the kid has a good protective layering in case the rats bite hard and run through the forced socailization with the kid being the instigator. though, it may just be easier to keep the kids and the rats separate from each other
i'm not saying the rats learned it from you at all. i'm saying that if these rats came to you from an unknown 1st origin such as from a pet store or as a rescue, you can't be sure of their past experience and perhaps have learned to fear small children through previous rough handling. as far as rats being aggressive to people they don't know seems odd. normally rats are very friendly, socail little critters that like just about anyone who's nice to them. and if you believe you know the reason for their aggression why are you asking us?
I don't know or understand where they'er aggreshen is from. As for they'er aggreshen to strangers they aren't aggressive when they'er out with me. I can be anywhere and if someone comes near they'er fine. Even with little kids. It seems they only act aggressive when they'er in their cage.
Maybe they hold them too tight?? I know my lil cusin ( lil :twisted: ) and she would hold my gunie pigs real tight . Of course i was like 12 then so i "had" to let her hold them and mom never believed me when i told her. She saw herself one day and i didn't have to anymore
Even kids that are a little older (around 10 or 11) sometimes get stupid around animals. I've had random cousins over for holidays with their family, and they'd of course want to see my pets. I can't tell you how many times I've escorted children out of my room for chasing BunBun.