I would say that many of these things ARE a matter of strong or weak faith. Paul himself implies this in Rom. 14:2. However, it is true that it is not our place to decide whose faith is at what level, or to look down on people whose faith is weaker or stronger than our own. If someone admits, though, that their faith is weak, or whatever, we have every right to acknowledge that, and to act accordingly by seeing that we don't put a stumbling block in front of them. For instance, if we know that someone struggles with alcoholism or that they are offended by alcohol, we should not drink in front of them, whatever we may believe about it. Here's Paul's example:
"Therefore let us stop passing judgment on one another. Instead, make up your mind not to put any stumbling block or obstacle in your brother's way. As one who is in the Lord Jesus, I am fully convinced that no food is unclean in itself. But if anyone regards something as unclean, then for him it is unclean. If your brother is distressed because of what you eat, you are no longer acting in love. Do not by your eating destroy your brother for whom Christ died. " - Rom. 14:13-15
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I agree.