If you've been vaccinated (both doses), you should be fine. Indications are that vaccinations greatly reduce the amount of serious illnesses caused by Covid (around 96% success rate), but it's possible that you could still contract it and become contagious, even with no or very mild symptoms. The research may later show that this is not the case, but I believe they're encouraging continued mask wearing out of an abundance of caution until they've got more data on the infection rates after vaccination. You could conceivably still become infected and spread the illness to someone else. I'm of the opinion that once everyone who wants to be vaccinated has had the opportunity to get one, go back to normal and anyone who chooses to pass on inoculation and gets extremely sick or dies has nobody to blame but themselves. I actually know (knew) a guy who fit into this category. I'm fairly confident he would do things differently were he given a second chance, but instead he's been dead a couple of weeks now. I have a feeling that in a few months there will be a second wave of people getting vaccinated as those who chose not to get it when first offered start to realize that they're the only ones still getting sick and dying.