Breastfeeding around kids (please read description)

I'm all for breastfeeding I have no problem if your gonna do it in public. Your child is hungry. However I was bother by it once and wanted to know if anyone feels the same. I took my 3 yo sister to an indoor park and a mom was feeding her infant. No problem right? But then her other child around the same age as my sister came up pulled up his moms shirt and started feeding. And my sister took note and I felt weird having her see that I didn't think it was appropriate. And by the looks of a few other parents they look a little disturbed too. What's your veiw?

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