Hah, I'm really glad you shared this. I've never heard this perspective or impression on Armenians before.
Note that Armenians were pushed out of Armenia in waves twice in recent history- once during the genocide in the early 20th century and again during the collapse of the Soviet Union. Many times over, the population of the diaspora is greater than that of Armenia itself. The diaspora also tends to concentrate acutely, in that there are specific and very dense populations of Armenians wherever they are around the world. I imagine those Armenians are probably genocide-era settlers that, socially, crafted a perceived sense of entitlement as a means of survival. I'm sorry that this impression was the result.
Armenians are certainly smelly, but not dirty. They're certainly survivors, but not predator opportunists/land-grabbers. You seem to be exercising attribution bias.
edit: we both, in hindsight, not just you ;)