It sounds too much like "parasite" for me to be comfortable using it. I'm assuming some random person made it up. It's okay to just say "people of/from <place>", guys.

Having grown up in Dallas, I usually just say "Texan" and call it a day.

Dallasians? Dallasers? Dallaslets?

Dallards?

What's your better suggestion? Dallasonian? Dallaser? Dallasan?

Also, do you have the same issue with the demonyms Manhattanite or Seattleite?

Texas -> Texan Kansas - Kansan Honduras -> Honduran

It should be Dallan?

Dallmatians

better than "cityofhate" which is what we're called most of the time.

I like North Texans

I thought it was a typo, or strange url at first.