The vaccine does not make you fully immune, and the vaccine does not necessarily prevent you carrying and transmitting the virus. It just makes it less likely to happen (and you're certainly much less likely to become a coughing superspreader).
I don't know about where you live, but many places in the world have not yet reached levels of vaccination that would make make masking and social distancing redundant.
I don't know about where you live, but many places in the world have not yet reached levels of vaccination that would make make masking and social distancing redundant.