People's thoughts on this??

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So in my area someone has tested positive for the coronavirus and by what they posted on facebook had suffered really bad with it.. now this persons partner (they live together along with a young child) has been going out visiting parks with her child etc. Someone called her out for this and all hell broke lose. She thinks as shes not showing symptoms she doesnt need to self isolate and was getting really horrible with people (shes just that kind of person anyway). Were as my little brother has really bad asthma.. has a really bad cough but that's it. My mam has took no chances and is keeping the whole house isolated for 14days. Which I thought was normal procedure. So why is this lass on facebook being high and mighty with people who have called her out for not staying in. Or Have I got it wrong?