Am I overreacting??

So my boyfriend’s 8 year old son is in a TON of activities. More than what I think is healthy but it’s not my business. He has brought Covid to our home 2x both times I caught it while pregnant all because my boyfriend can’t follow simple guides to prevent spread because god forbid his son can’t run wild for a couple days. We now have a 3 month old and his son has hand foot and mouth. We live in a one bedroom and his son has the only room so you would think he just keep his son in there with no contact to the baby and for him to wash hands/lysol quick before coming to see baby and stay out of the babies face. I know how he is so every time he try’s to come get close I have to ask “did you wash your hands?” This last time he says no and proceeds to use a water wipe to wipe his hands and leans into the babies face. I snapped at him and made him put his hands out like a toddler so I could put hand sanitizer in his hands to use. It makes me sick and feel like he doesn’t GAF about our son but will bend over backwards for his oldest. Not to mention when his oldest is home with us he acts as if they are renting his sons room from strangers and shuts us out, he will check in a couple times at night but it does not feel right more like an annoying obligation. Am I being over protective or idk I’m exhausted and stressed.