Answers

2014-03-06T14:50:27+01:00
When you're using "upset by", you're stating the cause for a possible stomach problem.
When you say "upset with", you're saying that you're angry with someone or something.

I'd use "upset with" in this sentence, or better still, say "Their behaviour upset me"
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  • Helping Hand
2014-03-07T21:10:17+01:00