It's not acceptable to me at least. I can have a discussion, that's all fine, but I won't have any missionary stuff. Try that, and I'll ignore/ridicule/insult/try to make you cry.
As for whether other christian groups do the same around the world, the answer is clearly yes. While all/most christianity is missionary, there are certain churches who are completely and utterly engulfed in it, and they are completely desperate to convert everyone to their belief, with an extreme intolerance for any other beliefs. All means seem to justify the end. Most people point and laugh, though.
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