People who are fully vaccinated against Covid generally don’t get sick from exposure to even the Delta variant. The odds of them getting sick, however, do increase with dramatically increased viral load intakes, hence the desirability of wearing face masks under certain conditions. Even when they do become infected, they’re often ‘asymptomatic’ and can be spreading the virus just as asymptomatic unvaccinated people do — thus, another reason to wear a face mask when appropriate.
Note: Vaccinations themselves do not ‘give’ people the virus. This misconception is based upon the fact that the first vaccinations long ago used micro doses of live viruses to inoculate people, which is not true any longer:
