How often is it necessary to bruise the feelings of others to be true to yourself? Just about never, in my experience. There are lots of occasions in The Fountainhead where others feelings are bruised, but this is their jealousy causing self-inflicted distress. You can often be true to yourself by discreetly keeping your own counsel, so long as you are not dissuaded from your own true desires.
If you are the boss of others, you should be able to do this honestly and without cruelty, even if you are a hard taskmaster and blunt in your opinions.