I think since these are people you don't know and who you are talking only online, then the best option is not talking to them. No obligation to talk to them.

I don't know if it's abuse or not but simple solution would be not to go on those sites.

My students often struggle with drama they get themselves into online. When they block people or get off the internet they always feel much better. I would think same with adults. If interactions on the Internet upset you, you have freedom of limiting or stopping it all together.

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