Oh good grief on all parts here.
First of all, that's not cyberbullying. Some random twitter users make a joke about her outfit- welcome to the internet...
And as Applewood mentioned, some people really need to get a life. Whether it was with Michelle Obama (both positive and negative) and now Melania Trump (again, both positive and negative), the obsession with what they wear is just weird. (I think FR even has a First Lady Fashion thread talking daily about her shoes- which is just as bad as the media complaining about her shoes).
Maybe it is because I'm a bloke, but unless is something is way off the wall, we just don't care.
Plus, I've seen some of the people who are critical of both aforementioned first ladies and gals, you have no room to talk.