A bit late, but since this is an interesting topic and maybe others will read it--we've actually had two particularly notable Gamorreans that used to be very active in roleplaying, and I was able to RP with them on a few occasions. As far as communication went, one roleplayed that he could speak a little bit of Basic, but only barely enough to make himself understood, and the other roleplayed a complete inability to communicate verbally. In both cases they relied mostly on actions, so in writing, they would try to focus on how they were coming across to others. Instead of being able to communicate "That person over there makes me angry," they'd gesture furiously at the offending person and grunt in an angry tone, for example. :pEdited By: Syn on Year 11 Day 186 1:34
The way that you write it yourself makes it easily understood by the players reading what you write, and then they can choose how their own characters perceive it. Droids or NPCs are options as well, but it depends on the direction you want to take your character. It's probably not fair to say that all Gamorreans hate droids or absolutely refuse to interact with them; some may find it necessary because of some past experience, etc. Just like not all humans are exactly the same in terms of their beliefs and prejudices.