Twitter

So my husband decided today that he wanted to have a twitter account. I had signed up for one forever ago so I was like well maybe I should give it a shot too. So we're both playing around with twitter and this super creepy girl starts following him. Totally raunchy vulgar tweets. Seriously, how do these people think that it's okay?? It blows my mind that some people have no boundaries. He blocked her etc but really people, is that necessary??