It is not about Chinglish, but age.
Children can play with children. Adults can play with children. But if teenagers/adults play with teenagers/adults, it sounds either childish or sexual. (I would say people over 13 or 14-years-old shouldn't say "play with".) An exception is if they play a game together, like video games.
Actually, the first week I was in China, some of my students said to me "Maybe we can play together some time," and I was very confused and a little uncomfortable. Later, I realized they probably just meant "hang out".
Instead, teenagers and adults can say:
Hang out with
Spend time with
Definitely don't ever talk about playing with yourself! You know why!
You can, however, play by yourself (alone).
I hope this is helpful!
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栗子的知乎答案索引:栗子树
栗子的微信公众号:E-Speller 或者 栗子英文 (只有精彩的原创)
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