Sometimes there are no private places for a mother to feed her baby other than a restroom and there aren't always chairs there, what's a mom supposed to do, squat on a toilet and listen some broad next to her farting while she's trying to nurture her child? Honestly, I've never seen a woman publicly breastfeeding who doesn't drape a blanket or something over her shoulder and child, most don't want anyone oggling their boobs, either.
As for the diabetic, sometimes shit happens, kind of like getting stung by a bee and needing an epi-pen.
I mean, if something bothers you emotionally but it's not impacting you (unlike second hand smoke), you can just look away and keep your opinions and comments to yourself.
That's the problem with this bullshit P.C. country, people walk around acting like they have the right to tell you how to conduct yourself and if your conduct isn't what they deem appropriate they act like it is not just their right, but their duty, to tell you so.