Why do Japanese people laugh when I'm talking about something serious?

It's one of the things I'm not used to in Japan, but I can't get used to being laughed at for something I said in earnest. For example, when I tell them about the ALS patient I met in the U.S. who is living with a feeding tube in his stomach, or about my contact with people in juvenile detention centers, or about the fact that I saw them go through a lot of painful things like rape and abuse befor

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これとだいたい同じだけどどうしたの？ https://www.reddit.com/r/japanlife/comments/s3rl7s/why_do_japanese_people_laugh_at_serious_topics_or/