Called a bad tank; wont' the first time, won't be the last welcome to the pug world of "it's always the tank's fault." Based on the limited information it seems like priest had no clue how to heal and look out for himself. What pugs forget is that every party member has a duty to look out for themselves at some point in a fight.
Shrug it off, like you said, and move on. To tank you need to be like a Closer in baseball, short memory.