Is telling your SIL that you don’t want your 4 month old that’s already sick to not be in your other SIL room that’s full of germs wrong?

I’m not getting along with one of my sister in laws, we are currently living under the same roof because of some medical issue that happened to my husband. We are living with his mother and all his siblings live there as well. So my SIL the one i get along with, took my son into the SIL I don’t get along with room. let’s call her A, I told A “A don’t put my son in that germ ass room” than the SIL I don’t get along with started talking shit, but I chose to ignore her. So she called me husband and told him that I disrespected her, called her room nasty and fifthly. My husband called me yelling at me and calling me disrespectful and etc. was I wrong to say that ? I mean the SIL her son is 5 years old and he be coughing without closing his mouth. I once told him in front of his mom to close his mouth I don’t want my son getting sick. His mom (The SIL I don’t get along with) said to her son “Tell her, we don’t care” that’s when I was like ok you don’t care about my son who was than like 2 or 3 months old getting sick. Ever since than, I know her son still doesn’t close his mouth. He be coughing hard in his mom room. So I don’t want my 4 month old son who is sick now and coughing hard as well In that room because it’s nothing but germs in that room. I know my son got sick because of her 5 year old son who obviously don’t care to close his mouth because the mother don’t care. So was I in the wrong to call her room the germ ass room? Cuz this family always say I’m disrespectful and starting shit with them when really it’s them starting shit with me I only get disrespectful when someone disrespects me first. Idk 😐