I know Ryan Winkler personally and professionally, and like and respect him a lot. I am not offended by his original tweet, nor do I see it as racist. I can see how it is controversial, and why he deleted it, but that speaks more to the ignorance of people reacting to it than to what Ryan actually said.
For better or worse, Ryan's district is so firmly Democratic that it would never elect a Republican representative under any circumstances, and he is very well-liked by his constituents, so I very much doubt this will go anywhere beyond the next day or two.