Emotional and personal are two different things. I can be emotionally touched if I see that something bad happened on the news. In the same way, I can easily imagine that someone can be emotionally touched if people are generally vile on the internet, even towards them, because they see it as 'bad news': there are evil people on the world or they are generally not accepted, whatever. This notion makes them feel bad.
What I have trouble imagining is that you feel personally offended if I say your mother is a cow, for instance. I have trouble imagining this because A) you know your mother is not a cow and B) you know that I know nothing about your mother so you know that I'm just saying stuff.
Maybe a cow is a bad example, but the point is that I have trouble imagining people being offended by insults which are picked for no particular reason, as evidenced by the fact that someone doesn't know enough about someone else to come up with an insult that might actually hold true.
It's an entirely different story if you start telling things about yourself. If krellin would've meaningfully insulted brainbomb on the basis of brainbomb being an artist, fond of alcohol or crazy in love, in a way that brainbomb might think 'shit, he might be right', then I understand if brainbomb feels personally offended.
That said, I'm absolutely positive that people can get personally offended by someone saying something about someone they don't know shit about. I just don't *get* it. It seems irrational to me. I am 100% positive that this is a shortcoming in my understanding of humans. My post was merely meant as an observation of behaviour that I can't grasp.
I just refreshed and as brainbomb mentions, reminding someone of something is another thing that falls in the category of emotion, but I wouldn't consider it personally offensive. Again, krellin lacked knowledge about brainbomb's girlfriend and brainbomb was fully aware of this lack of knowledge, hence brainbomb could easily determine that it was just words thrown at him with purpose, but not with sincere meaning.