It is certainly true that believers should be patient with one another, especially with those who have recently been born again through faith in Jesus Christ. "...and be kind to one another, tender-hearted, forgiving each other, just as God in Christ has forgiven you. Therefore be imitators of God...and walk in love...". At the same time, when appropriate, believers should encourage one another, young and old, to conform to Scriptural admonitions. Continuing the passage from above, "...and there must be no filthiness and silly talk, or course jesting...".
As well, the sensibilities and consciences of those for whom language or whatever is a genuine offense should be considered. The NT is speaking specifically about eating meat sacrificed to idols, which in the abstract was fine, but it violated the conscience of some, when it says, "...if because of food your brother is hurt, you are no longer walking according to love...It is good not to eat meat or drink wine, or to do anything by which your brother stumbles." A current day example would be that many in the U.S., especially the South, believe that drinking alcohol is wrong. IMO, the Scripture is quite clear that this is not the case (yes, drunkeness or being controlled by it is sin), but in many cases it would not be good for the believer to do it as it would offend the consciences of many.
So yes, the motive of the heart is the most important factor in one's actions, but conforming to Biblical admonition and the consideration of others' conscience is also very important.