This sentence is reasonable. Your earlier "if I get it so what?" Implying you don't care about others around you if you do catch it is what's not reasonable.
Certainly the recommendation is not "freak out prematurely" so yes, you're doing a good job. Practice good hygiene, practice social distancing measures. Make sure you have the supplies you need for a successful quarantine. I'm glad I did.
Going by the greyed out comments, you could argue that they're already practicing good social distancing measures.
You won't know you have the virus until the symptoms hit you in a few weeks after infection, and that can only be confirmed after a test.
In that "incubation period" one can spread the virus
Main point: you have no frigging clue in the world if you have it.