First, she is hardly wearing particularly scandalous clothing. She's wearing pretty normal casual clothes. So she isn't "putting them on display" so much as "existing while having boobs."
Second, there is a big difference from people looking at an attractive person, which most people do on a regular basis, and going to her Twitter/Instagram/coming up to her in real life and being like "I want to to milk your huge mommy milkers" or some other shit like that. Her problem is with the latter. If you just want to stare at pictures/videos of her boobs. Then go for it. You can even discuss how much you love looking at her boobs with your friends or even online on message boards. Just don't direct that shit at her. That's just basic human decency.
General rule, if whatever comment you are gonna put on someone's Instagram/Twitter isn't something you would be comfortable saying in person to a person at like a bar or whatever, you probably shouldn't post it.
So what you are saying is that if we do feel comfortable telling a chick at the bar how she has nice tits then it's ok to post to their Instagram/Twitter that they have nice tits. Gotcha.
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Now Playing: "The Hunt for the Two Missing Nintendo 64 Games" An expansion came out, but I'm still a third of the way through!