Most people that bad mouth scorpios are not scorpios.
In my experience (i am a scorpio)the people that cant handle scorpios are the ones that try to manipulate others. They fail miserably when they try to manipulate a scorpio.
Scorpios when in love, can be loving, humble and very loyal, however, is not only scorpions the ones problem their egos. Every sign has his own ego trips.
The problem with scorpios is that they do not BS. So if you are not walking your talk, you will be sting. Scorpios are strait forward.
Scorpios do not betray people, they just get rid of the people that scuck energy with out giving what they offered to give.