The Bible has a couple sections talking about responsibility to the "weaker brother", primarily 1 Corinthians 8 and Romans 14. Both ask someone stronger in their faith, who is not disturbed by something like eating food sacrificed to idols, to forgo it if it'll offend a brother or sister weaker in their faith. I think it's fairly obvious to say this concept applied past the scope of eating into general behavior, and it's a commonly accepted principle in most American mainline traditions.
The problem is, it's been my experience that there's some Christian somewhere offended by anything, as you are all probably realizing given the Q&A on this Stack Exchange. I've known Christians against Halloween, against Christmas, against instrumental music, against worship on Sunday, against evolution, against creationism... And especially when you deal with larger, more diverse groups, like you tend to meet in Internet-based Christian communities, there's always a weaker brother offended by some belief or practice of yours. Needless to say, there are also people "offended" by mutually contradictory beliefs or practices.
And, unfortunately, many of them like to use the weaker brother scriptures to justify why you should behave differently. It's effectively the "you shouldn't do anything I don't like" argument, or at least "you shouldn't speak out about having a belief different than mine on this subject."
How does one handle the "weaker brother" issue? How does it not become carte blanche for people of a controlling mindset to not manipulate you into behaving the way they think you ought?
Here, in the spirit of how SE should work, I'll provide a specific time I faced this behavior, with the caveat that this question is NOT ABOUT THIS SPECIFIC ISSUE, so please don't give your personal opinions on its morality (open another question for that if you really want to).
I am a Christian, and play role-playing games (and am a mod on RPG.SE). I had been involved in an online Christian RPG group, the Christian Gamers Guild, back in the day. There were no end of people coming by and saying that from a weaker brother perspective, that a) we shouldn't play those games, b) those games are OK but not if they have magic or various gods in them, c) are OK as long as they're not Dungeons & Dragons, d) are only OK if they have an explicitly Christian theme, e) are only OK if they don't have Christianity in them (because that puts the gamemaster in the place of God) and so on, in manifold and often contradictory glory. Some were drive-bys, but others were group members who were offended by others' gaming preferences.
Because of this and tolerance for other essentially insane behavior (e.g. tolerance for extremely disruptive and inappropriate behavior in the name of forgiveness), I decided it was easiest to just not participate in the group, problem solved. But of course it's against the spirit of Christian community to just avoid all churches and social groups, or, I think, to be seriously cagey about all details of your life and beliefs because someone in that group won't like it and be "offended" and "stumble," right?