My DH grew up with Boston's.
They don't call them Boston "TERRORS" for nothing!
Some people assume that since their physical appearance is similar to a Boxer (only smaller) that they might have the same personality.
In my experience.....THEY DO NOT. <just my opinion>
But I am coming from a place of having been around quite a few over the past 20+ years that were all raised by my inlaws. I could be a little jaded!
I'm sure they are perfectly well rounded dogs when not raised by those that are clueless. All of the Bostons my inlaws (including both sister-in-laws) have had including current ones have been biters/nippers to adults and children.
Again....just my opinion!!!