That is not anti solidarity, I know Afternative für Deutschland voters like to frame it this way but it's not.
That is not an argument though. He gave a specific example.
You brought up only AfD, without giving any counter-example or refuting his arguments. That's now how a discussion should work.
See it from the other side: the argument IS ENTIRELY IRRELEVANT with regards to AfD or any other party. So, an argument should be made from this point of view as well.
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Please keep your narrow political views to yourself. Just because someone tells and true fact about hundreds of thousands of Ukrainian refugees that didn’t payed a single Euro into the health insurance system keeps on benefiting from it, doesn’t make them an AfD voter. That’s a sentiment shared by people from every political spectrum in Germany from Linke to AfD.
If you like it or not, it is anti-solidarity if you benefit from a system that you have never contributed. That is just free loading and one should be ashamed of it.