It's not quite as easy...
In Germany many "older" immigrants are that miffed because of the "refugee welcome" movement because they see it as a kick in their own arse. That they had been forced to work hard from scratch...and nobody greeted them with teddy bears at the stations and made sure they were missing no tiny piece of welfare and support money and got their full rights like the natives....
For many the new migrants seem to be treated better than the natives (and that includes the earlier migrants)...they have immediately access to all welfare and rights and status like nobody before them. Like a "positive discrimination" if you so want.
And that makes understandably bad blood...at least that is the case in Germany. Most "earlier" Germans (natives or immigrants) want to deny them the same rights because it's unfair, they never had to work for them, had never put in something in the common pot, have just come and immediately begin taking out of said pot!
(Abit more discrimination and less rights/welfare from the start would probably help with the acceptance but that would be oh so politically incorrect!)