Hello
@Jo555, it's hard to answer that question without specific examples to consider.
If, for instance, you're referring to doing the basics to make yourself presentable in public (things like bathing, combing your hair, wearing clean clothes, etc.), that's one thing, but if you are talking with family or friends and someone brings up the oft used contemporary phrase, "
love is love" (for instance) as a positive statement, then you, as a believer, have a problem, even if the group doesn't ask you for your opinion on the matter and you remain silent (because whenever we, who are known to be Christians, do not say something/fail to push back in some way about such statements, our silence will always be perceived by unbelievers as a tacit approval

).
The same scenario can be problematic for those in our company who are not yet mature in the faith, who know something of what the Bible has to say about sexual relationships outside of traditional marriage (e.g. see the two examples below) and who are then confused (or even emboldened) by our apparent disregard for it (for what the Bible teaches, that is).
1 Corinthians 13
6 Love does not rejoice in unrighteousness but rejoices with the truth.
1 Thessalonians 4
3 This is the will of God, your sanctification; that is, that you abstain from sexual immorality;
4 that each of you know how to possess his own vessel in sanctification and honor,
5 not in lustful passion, like the Gentiles who do not know God.
So, we must "
speak the truth" to others for their sake (~especially~ in certain circumstances and, quite frankly, as often as we can

), but we must also always do so "
in love", always regarding others and their eternal well-being as something that is more important than our own, temporal comfort/well-being or reputation

(e.g.
Philippians 2:3-4).
God bless you!!
--David
p.s. - I've found the following admonishment (by theologian/pastor, Dr. Ferguson) to always result in good (for myself and others) ... whenever I remember (and choose) to follow it. The problem is, I don't (always follow it, that is), because I am still oft-times bent on being a people-pleaser (who prefers to be known/liked by all as a nice guy) instead of as someone who stands on principles and upsets the apple cart, if necessary.