I have met and worked with here in Canada (and some are currently good friends) Jordanians, Iranians, Syrians, Lebanese but I have never met any Palestinians.

Can anyone here provide any insight to this as to why?

I'm Jewish, and I know many Palestinians in Canada, both in Toronto, where I live, and in Montreal, where I grew up and still spend much time. I just checked with a Palestinian friend I know through my Jewish-Palestinian dialogue group and she said there are 30,000+ Palestinians in Canada; mostly in major cities like Toronto, Montreal, Ottawa, Vancouver, etc.