What are your opinions/experiences with Gypsys and Travellers?

My soon to fiancé is a traveller and my family speak so negatively about his way of life and they tend to stereotype him with all the negativety that people hear about them. I on the other hand don't judge people on other peoples opinions, but there is obviously a reason that they have a name for themselves, what are your opinions and experiences with Gypsys and travellers?